[msg]

Linus's biography, Just For Fun, is not bad.

I have sentimental attachments to Man Out of Time, the Tesla biography.

No Man Knows My History is about Joseph Smith, founder of the Mormon church. It is naturally controversial to the LDS, for its depiction of Smith as a polygamist con man who fell sideways into a religious racket and never quite fell out. I found it very readable, full of color. It might depend on your interest in the period and the subject matter.

Stephen King's On Writing is about half biography, half writing manual. I thought it was terrific. It's had several rereads already.

[msg]

I forgot another all-time favorite. I must've read this one when I was about 10 and a couple of times since. Genghis Khan: Emperor of All Men, by Harold Lamb.