President of Knowledge Systems for 20 years - since founding, along with Don McCracken, a 1981 spin-off from the Computer Science Department at Carnegie Mellon University.
on the web
Engineering Large-scale Hypermedia Systems: Lessons from 24 years of Hypertext R&D
Tutorial at Hypertext 2002. (Includes an fairly extensive and up to date biography.)
http://www.cs.umd.edu/ht02/tutorials/largescale.shtml