Richard Phillips Feynman

Was an American theoretical physicist, known for his work in the path integral formulation of quantum mechanics.

scientist Richard Feynman in the classroom.

Feynman developed a widely used pictorial representation scheme for the mathematical expressions describing the behavior of subatomic particles, which later became known as Feynman diagrams.

Here's a time line of Mr Feynman's life:

The reason he could answer so many questions is that at some point or other he’d worked it out before. He’d have thousands and thousands of pages of notes in a very organized fashion.

-- Lawrence Krauss, American-Canadian theoretical physicist and cosmologist.

If you have time, you should read more about this incredible human being on his Wikipedia entry.