David Baron is an American computer scientist, web browser engineer, open web standards author, technology speaker,[3][4] and open source contributor. He has written and edits several CSS web standards specifications including CSS Color Module Level 3,[5]CSS Conditional Rules,[6] and several working drafts. He started working on Mozilla in 1998,[4] and was employed by Mozilla in 2003 to help develop and evolve the Gecko rendering engine, eventually as a Distinguished Engineer[7] in 2013.[8] He was Mozilla’s representative on the WHATWG Steering Group from 2017-2020.[9][10] He has served on the W3CTechnical Architecture Group (TAG) continuously since being elected in 2015[11] and re-elected subsequently, most recently in 2020.[12][13] In 2021 he joined Google to work on Google Chrome.[14]