Surely you're joking Mr Feynman is an autobiography and definitely does not reflect Feynmans life unbiasedly. Its a great book but if you want a more unbiased account of his life check out Genius by James Gleick.

Walter Isaacson also just came out with a biography on da Vinci and he has one on Benjamin Franklin, though I never finished it, it was written to the same standard as Einstein.