W3C

Directory of W3C Invited Experts

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W3C Invited Experts are individuals who are invited by a chair of a Working Group to participate in that Working Group. The chair and the W3C staff must agree that the individual brings particular expertise to the group prior to inviting the individual to participate.

Please read more about principles and instruction in the about page.


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Patricia Aas

Patricia participates in:

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Joseph Abhayaratna

Joseph participates in:

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Jake Abma

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Yuriy Ackermann

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Glenn Adams Consultant

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Isaac Agudo

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Cristiano Aguzzi

Cristiano participates in:

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Riccardo Albertoni

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Abdulrahman Alkhelaifi

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Jim Allan

Jim participates in:

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Christopher Allen Blockchain & Decentralized Identity Architect

Christopher Allen is an entrepreneur, technologist, and educator who specializes in collaboration, security, and trust. As a technical pioneer, he’s initiated cross-industry collaborations and created industry standards that influence the entire internet. Though he’s worked within numerous privacy and security sectors, Christopher’s recent emphasis has been on engines of trust such as blockchain, smart contracts, and smart signatures, with special emphasis on decentralized sovereign identity. Christopher’s focus on internet trust began as the founder of Consensus Development. There, he worked with Netscape to develop SSL and co-authored the IETF TLS internet draft that is now at the heart of all secure commerce on the World Wide Web. More recently he facilitated a design workshop on Rebooting the Web of Trust, which generated several white papers about the next generation of internet privacy, security, and identity software. He is currently Principal Architect at Blockstream, leading blockchain standards efforts.

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Matitiahu Allouche

Matitiahu participates in:

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Niklas Andreasson

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Rachel Andrew

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Ashish Ashutosh

Ashish participates in:

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Malika Aubakirova

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Luc Audrain

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Arman Aygen Innovation and Strategy Manager

I’m passionate about telling the world about safe and secure innovation and sharing inspiring stories. Startup experience from VC to acquisition, self starter, driven, strategic development and customer centric, high performer currently upstarting in a global organisation. Proven track record in cross-region business development and management with a strong technology edge. A team leader working in strategic initiatives, product development, marketing and complex solution selling. Excellent facilitation, presentation and communication skills, strongly analytical with attention to detail and ability to execute and deliver. Currently leading our H3 Collaborative innovation incubator, always looking for the next business innovation, and leading our global Mobility Security business development and thought leadership

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Tavmjong Bah

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Sina Bahram President

Sina Bahram is an accessibility consultant, researcher, speaker, and entrepreneur. He is the founder of Prime Access Consulting (PAC), an inclusive design firm whose clients include technology startups, research labs, Fortune-500 companies, and both private and nationally-funded museums. Sina has a strong background in computer science, holding undergraduate and graduate degrees in the field. As a recognized expert in accessibility, Sina enjoys collaborating with both colleagues in the field and individuals of diverse professions to devise innovative and user-centered solutions to difficult real-world problems. In 2012, Sina was recognized as a White House Champion of Change by President Barack Obama for his work enabling users with disabilities to succeed in Science, Technology, Engineering, and Math (STEM) fields. In 2015, the international accessibility community recognized Sina as an Emerging Leader in Digital Accessibility at the annual Knowbility Community Heroes of Accessibility Awards. In 2017, Sina served as the invited co-chair of the 2017 Museums and the Web conference.

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Bruce Bailey

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Daniele Bailo

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Shirisha Balusani

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Vlad Baluta

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James Barclay

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Adnan Bekan

Adnan participates in:

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Amelia Bellamy-Royds

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David Benoit CTO

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Zoë Bijl Mx.

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John Birch Strategic Partnerships Manager

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Brian Birtles Representative Director at Birchill

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Philipp-Alexander Blum

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Philipp-Alexander participates in:

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Paul Boyes Director of Telematics and Standards

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Rachael Bradley Montgomery

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Laura Brady

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William Brown

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David Browning

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Pavlo Buidenkov

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Donna Bungard

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David Burns Mr

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David Carlisle

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Laura Carlson

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Amy Carney Accessibility Specialist

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Nicolò Carpignoli

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Corinne Cath-Speth

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Sukriti Chadha

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David Chadwick Emeritus Professor of Information Systems Security

David was Professor of Information Systems Security for 15 years at the University of Kent, UK, until he retired in February 2020. Upon his retirement he was honoured with the title Emeritus Professor. He still keeps his university email address and academic relationship, although he is no longer a salaried member of staff. Upon retiring from the university, David became CEO of Verifiable Credentials Ltd, a university spin-out whose objective is to evangelise Self Sovereign Identity (SSI) based on the twin W3C standards FIDO2 and Verifiable Credentials, without mandating either blockchains or DIDs.

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Matthew C. Chan

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Yijun Chen

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David Clarke

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Jean-Philippe Côté Professor & Artist

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Franck Cotton

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Dave Cramer

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Andrew Cunningham Manager, Research and Development

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Deborah Dahl

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Lubna Dajani

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Leonard Daly Owner - Daly Realism

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Makx Dekkers

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Jennifer Delisi

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Mehmet Oguz Derin

Mehmet Oguz participates in:

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Ian Devlin Web Developer

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Mike Dolan CTO

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Sam Dooley

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Nick Doty

Nick Doty worked on privacy in Web standards, acting until December 2015 as the team contact for the Tracking Protection Working Group and Privacy Interest Group.

Nick is also a graduate student at the UC Berkeley, School of Information where he occasionally teaches the Information Organization Lab and does research on Internet privacy.

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Sylvie Duchateau

Sylvie Duchateau worked for 15 hears in the field of web accessibility at Association BrailleNet, France, where she trained people, helped write outreach documents on web accessibility, talked at confrences, translated documents. She has been participating in EOWG Education and Ooutreach Working Group since 1999. She has also coordinated the French Authorised Translation of WCAG 2.0. Sylvie is still training, doing outreach and talks about Web Accessibility and has been working for the company Access42 since 2014.

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Kim Duffy

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Martin Dürst Aoyama Gakuin University

Martin is a full Professor at the Department of Integrated Information Technology of the College of Science and Engineering at Aoyama Gakuin University, chairs the W3C Internationalization Interest Group, and regularly participates in discussions in W3C and the IETF about Internationalization and Web technology in general.

Martin joined the W3C team at Keio-SFC in December 1997 to work on Internationalization, on a position as Project Associate Professor at the Graduate School of Media and Governance. From November 2002 to March 2004, he was a Visiting Scientist at MIT/CSAIL.

Prior to joining W3C, he was at the University of Zurich, Department of Computer Science, and was an active particpant within the HTML and CSS Working Groups as an invited expert on internationalization.

Martin obtained his masters degree from the University of Zurich in computer science, business administration, and Japanese studies. He has a Ph.D from the University of Tokyo in computer science with a thesis on compression and progressive transmission of images.

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Michael Elledge Usability Specialist

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Kathy Eng

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Jim Evans

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David Farmer

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David Fazio Founder, President

Mr. Fazio is the Founder, and President of Helix Opportunity, a disability-related business, and organizational, development consulting firm that was funded by the California Department of Rehabilitation. His life’s work focuses on eliminating the unintentional stigmatization of individuals by their differences. David survived a traumatic brain injury at the age of 13 when an arterioveunuous malformation in the right parietal line of his brain became an aneurysm and ruptured into a softball size hemorrhagic stroke. It left him completely paralyzed on the entire left half of his body, and completely blind in the left half of each eye. He is an expert in neuro-psychological, and cognitive, user experience design.

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Caitlin Fennessy

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Detlev Fischer Accessibility consultant

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Dónal Fitzpatrick

I am presently a lecture (Assistant Prof.) at the School of Computing Dublin City University. In 1999 I received my Ph.D. from the School of Computer Applications Dublin City University; the title of my thesis being "Towards Accessible Technical Documents: Producing Braille and Spoken Output from LaTeX Documents". In 2000, I was awarded the prestigious Fulbright Fellowship to continue work in the area of accessible mathematics, and also to investigate how GIS data could be made usable by blind people. In 2001, I returned to DCU to take up the faculty position alluded to above. Both my teaching and research activities revolve around accessibility. Presently, I teach undergraduate courses in web design and HCI. In both modules, I base the content and assessment around the notions of Universal Design. I have been Principle Investigator on several national and EU grants. the most recent of these (Enhanced Government Learning EAGLE) was a multi-million Euro grant to introduce online training to local authorities across the EU.

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John Foliot Principal Accessibility Consultant

I am a 21 year veteran of Digital and Web Accessibility, living and working in Lanark, Ontario, Canada. (Last Updated 2020/11/01)

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Betsy Furler

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Ananya Gangavarapu

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Armin Gerl

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Robert Gibb

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Becky Gibson Becky

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Alejandra Gonzalez Beltran Dr

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Lennart Grahl

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Paul Grenier Developer

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Adrian Gropper

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Charles Hall Chief Accessibility Officer

Helping humans help humans through accessible technology. Designing since 1988. Developing since 1993. Entrepreneur since 1996. Agencies since 2000. Accessibility since 2008. W3C CGs since 2013. Mentoring since 2014. Speaking since 2016. Local Government Advisor since 2020. UX throughout. Recently: Senior UX Architect, MRM Learning Ambassador, MRM Member, Global Diversity Coalition, McCann Worldgroup

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Daniel Hardman

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Rae Hayward

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Luke Herbert

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Mathieu Hofman

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Scott Hollier Chief Executive Officer, Centre For Accessibility Australia

Dr Scott Hollier specialises in the field of digital accessibility and is the author of the book ‘Outrunning the Night: a life journey of disability, determination and joy’. With a Ph.D. in Internet Studies and senior management experience across the not-for-profit, corporate and government sectors, Scott is an internationally-recognised researcher and speaker. Scott’s roles include CEO and co-founder of the Centre For Accessibility Australia, holds academic positions at Edith Cowan University and the University of South Australia, and is an Invited Expert for the W3C Accessible Platform Architectures Research Questions Task Force. In addition, Scott is legally blind and as such has both a professional and personal understanding of the importance of accessibility.

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Sarah Horton

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John Hudson

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Christina Hulka

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Dael Jackson

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Tomasz Jakut

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Krzysztof Janowicz

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Ken Jones

Ken participates in:


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Madlaina Kalunder

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Deborah Kaplan

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Gregg Kellogg

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Brad Kemper

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Dongjun (Albert) Kim

Dongjun (Albert) participates in:

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John Kirkwood Digital Inclusion Director

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John Klensin

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Irene Knapp

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Lars Knudsen

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Tatsuo Kobayashi Mr.

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Toshi Kobayashi

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Jirka Kosek

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Michael Koster System Architect

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Piotr Koszulinski

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Konstantinos Kotis Postdoctoral research scientist

Konstantinos Kotis (ORCID https://orcid.org/0000-0001-7838-9691) owns a B.Sc. in Computation from University of Manchester (UMIST), UK and a Ph.D. in Information Management (Knowledge Representation & Management) from the University of the Aegean, Greece. He is currently an assistant professor at the Dept. of Cultural Technology and Communication of the University of the Aegean, a member of the Intelligent Systems Lab, and a research associate of the Dept. of Digital Systems of the University of Piraeus (a member of the AI lab). He is currently leading the Semantic Web and IoT research group of i-Lab (https://i-lab.aegean.gr/groups/semantic-technologies-group/). His research interests include but not limited to Knowledge Engineering, Semantic data management, Semantic IoT, Semantic CH, KG-based AI chatbots. He has published more than 60 papers (h-index:16, >1200 citations) in peer-reviewed international journals (incl. IJDST, KAIS, ILE, IJKEDM, FGCS, IEEE IS, IJWGS, IJMSO, Applied AI) and conferences (incl. ESWC, ISWC, KSEM, IJCAI, VLDB) and served as reviewer and reviewer in several journals and conference events (incl. IEEE IS, IEEE TKDE, ACM TIoT, KAIS, JWS, J.UCS, IJDMMM, ICTAI, IJCAI). He has also participated in several national and international projects, including among them, Grid4All (FP7, 2008), iCore (FP7, 2012), Internet of Things (Finnish Tivit/Tekes, 2012), AMINESS (Greek Research & Technology General Secretary. 2014), datAcron (H2020, 2016), Time Machine (H2020, 2019)). For more, visit http://i-lab.aegean.gr/kotis

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Manolis Koubarakis

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Tom Kralidis

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Richard Kranendonk

Privacy Geek and DPO for hire. Looking for the right co-founders to develop tools for facilitating Privacy by Default and by Design in organisations, and make regulatory compliance less dull.

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Peter Krautzberger

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Hazel Kuok W3C Evangelist - Southeast Asia Chapter

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Philip Laszkowicz Creative Technologist

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Bastien Latge

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Vladimir Levantovsky

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Lisa LeVasseur

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Edward Lewis

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Wenhe Li

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Paul Libbrecht Prof Dr

Recycled mathematician, teaching and developing Informatics. Home page, publications and blog: http://www.hoplahup.net/paul/

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Peter Linss

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Peter Lowe

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Blair MacIntyre Professor

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Tom Mahieu

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Giorgio Maone

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Célestin Matte

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Katy Mawhood

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Patrick Meenan Software Engineer (Web Performance)

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Maryam Mehrnezhad

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Vicki Menezes Miller

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Jan Miksovsky

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Sangwhan Moon

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Lei Mu Hacker & Founder

Mu Lei known as NalaGinrut has been more than 7 years GNU hacker. He is also an entrepreneur focusing on privacy-respect Web services.

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Eric Mwobobia

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Anthony Nadalin

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Jonathan Neal

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Ciciley Nelson

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Gerhard Nussbaum

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Tiger Oakes

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Lukasz Olejnik

Lukasz Olejnik comes from an information security background. His previous engagements include security engineering work at the Poznan Supercomputing and Networking Center and CERN. Lukasz holds a PhD from INRIA (Grenoble) in privacy. His research interests include information and computer security and privacy, especially as applied to online interactions with a special emphasis on the Web, user data disclosure and dissemination problems and privacy-sensitive matters related to Web browser functionalities, as well as Web security. In his research, he analysed user tracking and profiling on the Web. Examples include studies of Web history leaks, as well as privacy and transparency analysis of Real-Time Bidding. Lukasz published his works in venues such as NDSS, ESORICS, WEIS and Phys Rev. He has publications spanning fields such as quantum cryptography and privacy. He co-created the What The Internet Knows About You, a demonstrator of privacy risks related with Web browsing history disclosure via Web browsers. This project included a crucial educational component. Lukasz is also responsible for How Much Are You Worth project, which provided a transparency-aiding browser extensions and was capable of submitting data from users. The data was then leveraged to quantify the value of user data in Real-Time Bidding. Lukasz believes that private matters should stay private, but privacy risks should become public. He can be found on Twitter @lukOlejnik

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Kevin Olotu

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Jason Pamental Designer, Strategist, Tinkerer, Typographer

Jason spends much of his time working with clients to establish their typographic systems and digital strategy, helping design and development teams works smarter and faster, and running workshops about all of the above. He is a seasoned design and user experience strategy leader with over 20 years’ experience on the web in both creative and technical roles. Clients range from type industry giants, Ivy League and High Tech, to the NFL and America’s Cup. He also researches and writes on typography for the web: he’s author of Responsive Typography from O’Reilly, articles for .Net Magazine, PRINT Magazine, HOW, Monotype.com, and frequent podcast guest. Author of online courses for Aquent’s Gymnasium platform and Frontend Masters. He’s an experienced speaker and workshop leader, having presented at over 50 national and international conferences. The real story: mainly he just follows Tristan and Tillie around Turner Reservoir, posting photos on Instagram.

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Despina Pantazi

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Carlos Pastor Matut

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Kimberly Patch Interface Expert, Writer, Editor, Developer, and Musician

Kim is Mobile Accessibility Task Force Co-facilitator for the AG WG. She uses speech input and developed the Utter Command add-on that speeds Dragon speech input for command-and-control. As lead researcher for Duke University’s Rutherfurd Living History program, Kim architected a system for interactive transcripts. As a consultant, she helped PBS Frontline build a similar system. Kim got her start as a metro reporter in Washington D.C. for UPI and later founded the Internet beat as a Senior Editor at PC Week. Her freelance credits include the AP, Reuters, the Boston Globe, San Jose Mercury News, and Technology Review. She writes the PatchonTech.com blog.

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Andrea Perego Research scientist

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Peter Perlepes

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Silvia Pfeiffer Web Media Technology

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Mike Pluke

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Clemens Portele Managing Director

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Kris Raich Ing. MSc.

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Alan Reeve

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François Remy Layout and accessibility

Previously Program Manager for Microsoft Edge. Graduated Université Libre de Bruxelles.

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Stephen Repsher

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Dónal Rice

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Simon Rice

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Kate Roberts

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John Rochford

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Natasha Rooney Web Technologist

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Noam Rosenthal Web Performance Consultant

WebKit reviewer. Formerly participated in building browsers at Nokia, watches at Samsung, and making web sites load fast at wix.com. Contributing to open-source browser engines and to standards to make the web faster.

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Steven Roussey

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Christine Runnegar Senior Director, Internet Trust, Internet Society

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Peter Rushforth

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Cybele Sack

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Joey Salazar

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Felix Sasaki

Felix Sasaki joined the W3C in 2005 to work in the Internationalization Activity until March 2009. In 2012 he rejoined the W3C team as a fellow on behalf of DFKI (German Research Center for Artificial Intelligence). His main field of interest is the application of Web technologies for representation and processing of multilingual information.

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Kris Shrishak

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John Simmons W3C Evangelist - Media & Entertainment, Global

John Simmons is an industry recognized expert on Web media standards. He drove Microsoft’s efforts to define DRM-interoperable encoding, adaptive bitrate streaming, the collaboration with Google, Comcast, Netflix and the W3C for HTML5 Media Extensions and a multi-year Apple collaboration to develop the Common Media Application Format.

John’s standards evangelism across the media and entertainment industry led to the creation of the Consumer Technology Association (CTA) Web Application Video Ecosystem (WAVE) project, a 60-company collaboration to adopt ISO/IEC and W3C standards for streaming media on a global scale.

John received the CTA 2017 Technology Leadership Award for the creation of the WAVE Project and the National Academy of Television Arts & Sciences (NATAS) 2019 Emmy Award for the Microsoft, Google, Comcast, Netflix and W3C “Standardization of HTML5, Encrypted Media Extensions (EME) and Media Source Extensions (MSE) for a Full TV Experience”.

Recently retired from Microsoft, John now runs a media standards consulting business from his home in the Cascade Range foothills, east of Seattle, Washington.

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Varun Singh CEO

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Craig Smith

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Rhys Smith Dr

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Rob Smith

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Trevor F. Smith Research Engineer

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Neil Soiffer Senior Scientist

Dr. Soiffer received his PhD in Computer Science from U.C. Berkeley. He was a member of Tektronix's Computer Research Lab, where he created experimental math computation systems, math editors, and tools for embedded systems. Dr. Soiffer moved to Wolfram Research, where he was responsible for a number of user elements that are part of Mathematica, including the WYSIWYG math editor and programmability of Mathematica's notebook interface. He joined Design Science in 2003 and worked on math accessibility in their MathPlayer library which renders MathML both visually, aurally, and in braille. It works with browsers, Microsoft Word and PowerPoint, Adobe Reader, and other applications. Dr. Soiffer was a principal architect of MathML, and continues to have an active role in math-related standards. Currently, he is chairing the MathML refresh community group. He chaired the MathML in DAISY committee, was a NIMAS board member, and also a member of the EPUB 3 working group. He continues to be a member of the PDF/UA . He was awarded an NSF SBIR grant to make electronic documents that contain math accessible and along with ETS, was awarded a IES grant to make school materials containing math accessible.

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Andrew Somers Color Science Researcher

Andrew Somers has a broad base of experience in Television and Film in Hollywood, with major credits listed as public record on iMDB. He's been working with color, images, titles/text, and the related engineering issues since before personal computers were capable of displaying images. He's been at the forefront of digital imaging technology and was involved at the beginnings of Digital Cinema, and has been a part of the evolution of the related technologies ever since.

His specific work the last 15 years has been primarily Visual Effects Development & Supervision, Color Grading, Look Development & Editorial, and Title Design for feature films, including work on films such as the recent live-action Beauty and the Beast for Disney. Additional related work is in web design and other graphic design including book design and other print media.

This experience is coupled with a background in broadcast engineering, related vision and perception research, and coding (C/C++, PHP, Javascript, etc.). His current project is the research & development for a new color theory for a book he's writing on that subject.

His interests here with the Accessibility Working Group and the Low Vision Task Force are partly motivated by his personal struggles with visual impairments. He expects to utilize his extensive background in digital imaging & engineering to provide research and development toward improved standards and guidelines relating to visual accessibility for the WCAG.

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Volker Sorge

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Michael Specter

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Rudolf Streif

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Miriam Suzanne

Miriam is a web developer, designer, author, and musician — co-founder of OddBird, Teacup Gorilla, and Grapefruit Lab. She has taught for the Mozilla Developer channel, and is a staff writer for CSS Tricks, co-author of Jump Start Sass, member of the Sass & CSS Remedy core teams, and creator of the Susy and True open source tools.

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Lars G. Svensson

Lars G. participates in:


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Andreas Tai Engineer

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Gérard Talbot

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Nick Telford-Reed

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Ehsan Toreini Dr.

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Bobby Tung W3C Evangelist - Publishing, Taiwan

I started to participate W3C activities with "Requirement of Chinese Text and Layout", an i18n project. Now I'm W3C Evangelist in Taiwan to spread recent W3C standardization activities to Web Industry, and recruit member in Digital Publishing area and Banking, Telecommunications.

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David Turner

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Makoto Ueki

Web Accessibility Consultant in Japan. Makoto has been contributing to the JIS (Japanese Industrial Standard) Working Group and W3C/WAI AG Working Group as a web accessibility expert. And he has been a chairman of the Web accessibility Committee in Japan (WAIC) since 2012. IAAP - Certified Professional in Web Accessibility (CPWA), Certified Professional in Accessibility Core Competencies (CPACC) and Web Accessibility Specialist (WAS) since 2017.

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Rob van Eijk Technologist (DPA, ePrivacy, GDPR)

Rob worked on privacy in the Internet Architecture Board (IAB) Privacy Program. He contributed to the Tracking Protection Working Group, representing the European data protection authorities assembled in the Article 29 Working Party (WP29).

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Joost van Ulden

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Anton Vasetenkov Mr.

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Lea Verou Invited Expert, CSS WG

Lea is currently working as a Human-Computer Interaction researcher at MIT CSAIL and is an Invited Expert in the CSS Working Group. She previously worked at W3C between 2012-2013 as part of the W3C Developer relations and Web education efforts. She has a long-standing passion for open web standards and enjoys researching, blogging and speaking about them. She has released a number of popular open source tools to help web developers learn and use open web standards.

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Mark Vickers

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Luis Villa

Attorney in private practice, focused on intellectual property. Previously: Deputy General Counsel at Wikimedia; Open Source Initiative board member; author of Mozilla Public License (v 2.0); QA and software team manager at Ximian, Novell, and the Berkman Center at Harvard Law.

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Michelle Vu

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Rick Waldron

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Conrad Watt

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Stephen Watt University of Waterloo

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Johannes Wilm PhD, Anthropology

Johannes (German/Danish/Swedish) has studied social sciences and humanities with a focus on the Americas, Politics, and History in Norway, the UK and Sweden. He has conducted fieldwork in Douglas, Arizona and Nicaragua for extended periods of time and has lived in several Latin American countries. To pay for his other activities, he started doing (open source) web development with and has tried several times to create academic writing systems for non-technically inclined users so that others could take over more of his technical responsibilities in the creation of academic journals. Since 2012 he has worked on the web-based editor Fidus Writer, and in the process he has found that it made a lot of sense to connect with other, larger JavaScript editors to push for improvements in this area and to engage with browser makers through the W3C. Johannes is therefore mainly active in the Editing Taskforce.

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Daniel Wilms

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Peter Winstanley Dr

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Lionel Wolberger Dr.

Dr. Wolberger is experienced in digital accessibility, has authored patents, holds a PhD in anthropological and ethnographic approaches, and has managed, deployed and secured multi-million dollar systems for Fortune 100 companies used by tens of millions of people on almost every continent. He draws on a background in Agile development, systems architecture, machine learning, product management, InfoSec, Product Security, Blockchain, and Cloud, Dr. Wolberger has co-founded startups and as partner of TLV Startup Hub advised many founders connecting them with investors and corporate partnerships. Serves on W3C committees for Personalization, formerly on Verifiable Claims and Distributed Identifiers. A Privacy by Design ambassador, Cisco Security Ninja, and accomplished presenter on stage and TV, Wolberger enables individuals and groups to achieve their goals.

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Chris Wood

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Tomek Wytrębowicz

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Rachel Yager W3C Evangelist - Financial Innovation

Dr. Rachel Yager is the founder of FortuneTimes Group (FTG) 运时国际集团 a New York management consulting firm that accelerates international business growth – in startups and Fortune 500 companies – with state-of-the-art business techniques, emerging technologies and global best practice. Dr. Yager is also the founder of SymposiumX which brings together a community of W3C members and industry thought leaders in building the next generation of emerging technologies and standards for financial innovation.

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François Yergeau

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Sebastian Zartner

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Gottfried Zimmermann

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