Jim Gray
Seymour built simple machines - he knew that if each step was simple it would be fast.
When asked what kind of CAD tools he used for the CRAY1 he said that he liked #3 pencils with quadrille pads. He recommended using the back sides of the pages so that the lines were not so dominant.
When he was told that Apple had just bought a Cray to help design the next Mac, Seymour commented that he had just bought a Mac to design the next Cray.