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.


Photo of Patricia Aas

Patricia Aas

Patricia participates in:


Joseph Abhayaratna

Joseph participates in:

Photo of Jake Abma

Jake Abma

Jake participates in:


Yuriy Ackermann

Yuriy participates in:

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Isaac Agudo

Isaac participates in:

Photo of Riccardo Albertoni

Riccardo Albertoni

Riccardo participates in:


Abdulrahman Alkhelaifi

Abdulrahman participates in:


Jim Allan

Jim participates in:

Photo of Christopher Allen

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.

Christopher participates in:

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Matitiahu Allouche

Matitiahu participates in:


Niklas Andreasson

Niklas participates in:

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Bohdan Andriyiv

Bohdan participates in:

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Malika Aubakirova

Malika participates in:


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

Arman participates in:



Tavmjong Bah

Tavmjong participates in:


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.

Sina participates in:

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Bruce Bailey

Bruce participates in:

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Daniele Bailo

Daniele participates in:

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Shirisha Balusani

Shirisha participates in:

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James Barclay

James participates in:


Adnan Bekan

Adnan participates in:

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David Benoit CTO

David participates in:

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Zoë Bijl Mx.

Zoë participates in:


Brian Birtles Representative Director at Birchill

Brian participates in:

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Paul Boyes Director of Telematics and Standards

Paul participates in:

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Laura Brady

Laura participates in:


Allen Brown

Allen participates in:

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David Browning

David participates in:


Daniel Burnett

Daniel participates in:



Laura Carlson

Laura participates in:

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Amy Carney Publications Specialist

Amy participates in:

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David Chadwick Professor of Information Systems Security

David participates in:


Fred Chasen

Fred participates in:


Yijun Chen

Yijun participates in:

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David Clarke

David participates in:

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Franck Cotton

Franck participates in:


Andrés Cuervo AR Engineer

Andrés participates in:


Andrew Cunningham Manager, Research and Development

Andrew participates in:



John Daggett Software Engineer (Graphics)

John participates in:

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Deborah Dahl

Deborah participates in:

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Leonard Daly Owner - Daly Realism

Leonard participates in:

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Makx Dekkers

Makx participates in:

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Jennifer Delisi

Jennifer participates in:

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Ian Devlin Web Developer

Ian participates in:


Mike Dolan CTO

Mike participates in:

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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.

Nick participates in:


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.

Sylvie participates in:

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Kim Duffy

Kim participates in:

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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.

Martin participates in:



Michael Elledge Usability Specialist

Michael participates in:


Kathy Eng

Kathy participates in:


Jim Evans

Jim participates in:


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Dominic Farolino

Dominic participates in:

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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.

David participates in:

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Caitlin Fennessy

Caitlin participates in:

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Detlev Fischer Accessibility consultant

Detlev participates in:


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Armin Gerl

Armin participates in:


Robert Gibb

Robert participates in:

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Alejandra Gonzalez Beltran Dr

Alejandra participates in:


Lennart Grahl

Lennart participates in:

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Adrian Gropper

Adrian participates in:


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Charles Hall UX Architect, Technology

Helping humans help humans through technology.

Charles participates in:


Rae Hayward

Rae participates in:

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Luke Herbert

Luke participates in:

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Scott Hollier Adjunct Senior Lecturer, Edith Cowan University

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 project management experience across the not-for-profit, corporate and government sectors, Scott is an internationally-recognised researcher and speaker. Scott holds an Adjunct Senior Lecturer position at Edith Cowan University and teaches the Professional Certificate in Web Accessibility (PCWA) course at the University of South Australia. Scott is also 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.

Scott participates in:

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John Hudson

John participates in:



Dael Jackson

Dael participates in:

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Krzysztof Janowicz

Krzysztof participates in:



Madlaina Kalunder

Madlaina participates in:

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Sam Kanta Dr

Sam participates in:

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Deborah Kaplan

Deborah participates in:

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Gregg Kellogg

Gregg participates in:

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Sean Kelly

Sean participates in:


Brad Kemper

Brad participates in:


John Klensin

John participates in:


Irene Knapp

Irene participates in:

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Lars Knudsen

Lars participates in:


Tatsuo Kobayashi Mr.

Tatsuo participates in:


Toshi Kobayashi

Toshi participates in:

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Jirka Kosek

Jirka participates in:


Piotr Koszulinski

Piotr participates in:

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Manolis Koubarakis

Manolis participates in:

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Tom Kralidis

Tom participates in:

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Peter Krautzberger

Peter participates in:



Tobie Langel

Tobie participates in:

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Hai Liang

As a participant of UTC, Script Ad Hoc, and Unicode Editorial Committee meetings, I help Unicode and OpenType understand complex scripts—especially Indic and Mongolian ones. Based in Beijing, China.

Hai participates in:


Peter Linss

Peter participates in:

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Christine Loew Director, Accessibility for Digital Assessments

Christine participates in:

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Chris Loiselle

Chris participates in:



Tom Mahieu

Tom participates in:

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Giorgio Maone

Giorgio participates in:


Katy Mawhood

Katy participates in:


Brett McDowell

Brett participates in:

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Nellie McKesson

Nellie participates in:


Maryam Mehrnezhad

Maryam participates in:

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Vicki Menezes Miller

Vicki participates in:


Klaus Miesenberge

Klaus participates in:

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Jan Miksovsky

Jan participates in:


Rachael Montgomery

Rachael participates in:


Sangwhan Moon

Sangwhan participates in:


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.

Lei participates in:


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Clare Nelson

Clare participates in:


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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

Lukasz participates in:


Estella Oncins

Estella participates in:


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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.

Jason participates in:

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Devarshi Pant Devarshi Pant

Accessibility Consultant based out of Baltimore, USA. Core Strengths > Testing with Assistive Technology (JAWS / NVDA) > Code Inspection (Dev toolbar / ANDI) > ARIA

Devarshi participates in:


Despina Pantazi

Despina participates in:

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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 blog.

Kimberly participates in:

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Andrea Perego Research scientist

Andrea participates in:


Mike Pluke

Mike participates in:

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Clemens Portele Managing Director

Clemens participates in:


Anton Prowse

Anton participates in:



Kris Raich Ing. MSc.

Kris participates in:

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François Remy Layout and accessibility

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

François participates in:

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Stephen Repsher

Stephen participates in:


Yancy Ribbens

Yancy participates in:


Simon Rice

Simon participates in:


Kate Roberts

Kate participates in:

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John Rochford

John participates in:

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Natasha Rooney Web Technologist

Natasha participates in:


Kagami Rosylight

Kagami participates in:


Steven Roussey

Steven participates in:


Christine Runnegar Senior Director, Internet Trust, Internet Society

Christine participates in:

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Peter Rushforth

Peter participates in:



Cybele Sack

Cybele participates in:


Shivan Kaul Sahib

Shivan Kaul participates in:

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Yuri Shkuro

Yuri participates in:

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Varun Singh CEO

Varun participates in:


Craig Smith

Craig participates in:

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Keyonda Smith www.KMSmithPhD.com

Keyonda participates in:


Rhys Smith Dr

Rhys participates in:

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Trevor F. Smith Research Engineer

Trevor F. participates in:


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.

Neil participates in:

Photo of Andrew Somers

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.

Andrew participates in:

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Volker Sorge

Volker participates in:


Michael Specter

Michael participates in:

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Rudolf Streif

Rudolf participates in:


Lars G. Svensson

Lars G. participates in:



Gérard Talbot

Gérard participates in:

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Nick Telford-Reed

Nick participates in:


Ehsan Toreini

Ehsan participates in:

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Bobby Tung Evangelist

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.

Bobby participates in:


David Turner

David participates in:

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Bill Tyler Digital Accessibility Engineer

Bill participates in:


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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.

Makoto participates in:


Photo of Rob van Eijk

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).

Rob participates in:

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Joost van Ulden

Joost participates in:

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Anton Vasetenkov Mr.

Anton participates in:

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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.

Lea participates in:

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Mark Vickers

Mark participates in:


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.

Luis participates in:


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Lars Wallin Product Manager

Lars participates in:


Conrad Watt

Conrad participates in:

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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.

Johannes participates in:


Daniel Wilms

Daniel participates in:

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Tomek Wytrębowicz

Tomek participates in:



François Yergeau

François participates in:


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Gottfried Zimmermann

Gottfried participates in: