Dr. Jerry Cox is 89, leads his latest startup[1], remains a sr. cs professor @WashU[2], sold a company he co-founded (Growth Networks) for >$355M to Cisco in 2000, and is generally smart and inspiring. Also sat for a formal oral history focused on his contributions to biomedical computing[3].
[1] http://blendics.com/team/
[2] http://cse.wustl.edu/PEOPLE/Pages/cox.aspx
[3] http://beckerexhibits.wustl.edu/oral/transcripts/cox.html