Man, sad news indeed. Yup, still have my little white book somewhere, and I also remember meeting him and Arnie Aho and BK at a talk, or conference at Princceton in the early 80s (and I now believe both AA and BK are now teaching at Princeton too). Fascinating group of guys who collectively changed the face of computingas we know it. Or more correctly, defined computing as we know it. (Ok, with some elp from another Princeton guy by the name of Von Numann

).
It was good to be a computer geek in Princeton and in NJ in the 70s and 80s

.
-- Jim