I greatly admire Donald Knuth. He's humble, dedicated to his work in a healthy way, and has fascinating outside interests in organ music, for example. Most of

I greatly admire Donald Knuth. He's humble, dedicated to his work in a healthy way, and has fascinating outside interests in organ music, for example. Most of all, I see in him the playful attitude about computer science that Alan Perlis referred to: "I think that it's extraordinarily important that we in computer science keep fun in computing."