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I'm Tantek Çelik, Mozilla Web Standards Lead, developing and coordinating Mozilla work on web standards

I'm based in San Francisco, about once a week at Mountain View when I’m in the Bay Area.

See also:


Mozilla offices I visit in rough order of past frequency

want to visit

Offices I’d like to visit:

past offices


User pages of Mozilla folks I've worked / am working with:

Additional Mozillians I'm working with:


Arun Ranganathan, Brian Birtles, Austin King, Chris Blizzard, Dan Mills, Dietrich Ayala, Fantasai, Gordon Brander, Gregor Wagner, Johnny Stenback, Jonas Sicking, Josh Carpenter, Michael Hanson, Robert O'Callahan, Jet Villegas, Xidorn Quan


I’ve been participating in web standards for over twenty years, beginning with leading the implementation of the Tasman rendering engine in Internet Explorer 5 for Macintosh.

I’ve written and edited many Cascading Style Sheets specifications (CSS 2.1 & many CSS3 modules), but also co-invented microformats, drove key features of vCard4 in the IETF, and been part of HTML5 and the HTML Living Standard work at WHATWG (authoring one of the first books and video tutorials on HTML5).

I have served on the W3C Advisory Board 2013-2018, helping drive more openness and transparency in the processes of W3C as well as more liberal licensing of W3C standards.

I am particularly passionate about and actively involved in the IndieWeb movement -- standards, events, and community -- which you should definitely ask me about.

I hold Bachelor of Science and Master of Science degrees in Computer Science from Stanford, and 16 patents. I enjoy trail running, yoga, and bouldering. You can find out lots more about me and see active examples of my work on my blog at


  • 2011-176 - present: Mozilla employee
  • 2010-146 - 2011-175: Mozilla contractor
  • before 2010-146: occasional Mozilla contributor (e.g. irc, wiki, bugzilla)

See Also