Top image, top left to bottom right:

- Richard Dawkins, evolutionary biologist who, among many other noteworthy career achievements, first coined the word "meme" (the Internet thanks you!).

- Stephen Hawking, no description needed, he's Stephen Motherf**n' Hawking.

- Peter Higgs, theoretical physicist after whom the Higgs boson was named.

- Brian Cox, particle physicist and ATLAS project contributor at CERN.

Bottom image, left to right:

- Who cares?