He was actually a keynote speaker at one of Apple's first WWDCs. He was a registered Apple Developer (so was Harry Anderson, who I also think was a keynote speaker).
UPDATE: I think I may be wrong. I think it was another conference. I know he attended WWDC, but maybe didn’t keynote. They had some whacky keynotes and speakers. I know that Ken Kesey was a rather interesting one.
https://www.youtube.com/watch?v=8UNG3cQoOEc (not from the WWDC. I don’t know if there are recordings of the earliest ones).