Important people in Computer Science

List the names of important people in Computer Science and their contributions to the field. I will start.

Grace Hopper - She built the first compiler named A-0. She is credited with popularizing the term debugging, because she found a real bug (a moth) stuck in a relay therefore impeding the system.

You haven't talked about Knuth yet? Fuck you then.

Leibniz invented the binary system, know him.
Stephen Cook, Von Neumann and Alan Turing are also the first names that come to me.