Famous Computer Scientists?

How many computer scientists or other important people in computing are famous enough that people outside the field know their names? Which ones?

If you're not and never have been a computer science or computer engineering major, or professional programmer or system administrator or something like that, please leave a comment naming anyone you think of as a famous computer scientist or important person in the history of computing? Or that you can't think of any, because maybe the answer is that none are well known enough to be known to most people here.

(If you are or have been one of those things, you could comment too, but state your background)

Edit:

1. People who are primarily engineers who made significant contributions to the field of computing count.

2. Leave a comment with what name come to mind (or that none do) before reading other comments. Repeats are great! Then I know several people thought of that name.

3. ( Steve Jobs... )