Philippe Le Hégaret is responsible for the Document Object Model (DOM) Activity for the W3C. He acts as Team Contact for the DOM and Web Services Description Working Groups. Philippe was until May 2002 Chair of the W3C DOM and has also been a member of the XML and HyperText Coordination Groups. He has been involved in XML Technologies since 1997. He is a co-editor of the DOM Level 2 and DOM Level 3 Specifications, co-edited the W3C Note on Components Extensions API requirements, and co-authored the W3C Note on the Simple API for CSS (SAC). Philippe also wrote the first version of the CSS Validator in 1997.