Great article with a number of well-known references to biographies of Feynman. For those interested in Dirac, some excellent biographies have emerged over the years including: "The Strangest Man: The Hidden Life of Paul Dirac, Mystic of the Atom" and "Dirac: A Scientific Biography ". [0][1].

[0] https://www.amazon.com/gp/product/B002LDM8QS/ref=dbs_a_def_r...

[1] https://www.amazon.com/Dirac-Scientific-Biography-Helge-Krag...

"Dirac: A Scientific Biography" provides a more technical overview than Farmelo's book (not to detract from Farmelo's book which is very well written and provides a great deal of depth about Dirac the individual).

http://www.amazon.com/Dirac-Scientific-Biography-Helge-Kragh...