Terry Chay was the only Mac user at Plaxo, where he develops the web-based version of their product (they tolerate him because he stinks at CounterStrike). In past lives, he developed the communication layer between an internet-enabled home control device and the web browser, voice portals, PDAs and cell phones via SOAP in PHP, and the first internet travel search engine, also in PHP. He gives seminars on PHP development, which really is just a veiled excuse to play with Keynote. He also thinks its pretty cool that he can boast at least six years of Ajax experience in his resume when it has only been around for two of them.
Sessions by Conference
O'Reilly Open Source Convention 2006
O'Reilly Open Source Convention 2005
O'Reilly Open Source Convention 2004