Who would you want to meet over a beer? (Turing, Jobs, Knuth, Koch, Elmo, ...?)
I guess if I had to pick a dead genius, I might pick Stanley Kubrick, or maybe Andy Warhol... Nicola Tesla, I would want to just take him and fix all his problems for him. Descartes seems interesting to hang out with, just laying around in tents visualizing coordinate systems and what not. Yeah.