by Richard P Feynman (ed. Michelle Feynman).
The Correspondence of physicist, Nobel laureate and bongo player, Richard Feynman.
Anyone who thought they'd heard the last of Feynman is in for a real treat. It turns out he was a great letter writer.
Although more serious than his popular funny books, Feynman's witty personality comes through in his letters. Reading them en masse, you get to appreciate that his philosophy on life was consistent throughout his life: do what you enjoy doing.
That's a great philosophy.
(Excellent book, by the way.)