Feynman was a brilliant physicist who led a sometimes complex but very interesting life. You can read more about him at his official website.
Feynman wrote about himself, and also inspired others to write about him. Surely Your Joking Mr Feynman! is a classic set of anecdotes about Feynman’s life.
To get a fuller picture of Feyman’s life, Genius by James Gleick is extremely interesting and is one of the best biographies I’ve ever read.
Feynman won the Nobel Prize for his work in quantum electrodynamics, which is most complete theory yet invented for describing the interaction of light and matter. In QED: the strange theory of light and matter Feynman explains to a lay audience what this theory is about.