Best Scientists OAT

[Rduke55]

I was talking with some friends recently about how the general public perceives science and was wondering who people here would rate as the best scientist in the below fields. I'm thinking about both in influence and talent (although feel free to separate them). Life sciences are the detailed ones since I'm biased.

1) Genetics

2) Neuroscience

3) Infectious diseases and/or human health

4) Biology in general

5) Physics

6) Chemistry

7) Mathematics

Feel free to drop some other subjects in or break up some of the subjects (physics could probably have a few categories but please make them relatively general).
Please give some reasoning on why you chose who you did.