Inventor of the SmalltalkLanguage (along with several other collaborators at XeroxParc) and early evangelizer of ObjectOrientedProgramming. It could be argued that he was the primary trigger of the popularity of OOP starting in the mid 1980's, resulting in almost every new language having at least some support OOP in it since.
Alan tells his own story in the EarlyHistoryOfSmalltalk.
A founding father for our fledgling discipline?
Some pages featuring AlanKay:
The complete text and images of AlanKay and AdeleGoldberg's "Personal Dynamic Media" is available linked from this page (along with writings by TedNelson, BrendaLaurel, etc): http://www.newmediareader.com/excerpts.html.
June 15th, 2001 - Alan Kay is supposedly leaving Disney this September with 6 other SqueakSmalltalk programmers. http://maccentral.macworld.com/news/0106/15.alankay.shtml
See OpenCroquet for his new project, a 3D distributed workspace in Squeak. -- I get the impression that his role in Croquet is mostly lending his support and star power to the work of others. (Not at all a trivial contribution, of course.)
There is an interview with AlanKay at http://www.mprove.de/diplom/gui/kay02StillWaiting.html.
Did he actually do anything at Disney? Or was he just a trophy hire?
Yes, he did something at Disney. He led the Squeak project. He developed the e-toys and the others developed all the support software. They don't publish many of their e-toys, but you can find the support software at http://www.squeak.org.
Alan Kay was as of November 2002 at HP, working on his new project, OpenCroquet.