Founder of AutoDesk.
His site is very good and is at http://www.fourmilab.ch/
And apparently can't figure out how to use Excel... (evidence?)
Yet he, through AutoDesk, was one of the forces that propelled MicroSoft to become a dominant platform for business use. (Hmm, spurious, baseless.)
I especially like the story in the AutoDesk papers about the triumph of accounting over reality.
Before AutoDesk, John founded a hardware integration manufacturing company called Marin Chip. Among other things, Marin Chip pioneered the translation of numerous computer language compilers to Intel platforms. However, to say that John's efforts "propelled" Microsoft to dominance is kind of like experiencing a good bottle of wine by trying to peel off the label. There was at the time a "right" way to do things like chip design, board fabrication, and software integration. John was a big part of that - without personally buying into WinTel as some ultimate solution. See his predictive and forward thinking: Microsoft at Apogee, http://www.fourmilab.ch/documents/msapogee.html
Other John Walker trivia: