Street Justice by Chuck Zito
Some of you might know him as 1 of the Italians on Oz. He's an actor, bodyguard, stunt man, retired Hell's Angel, a Golden Gloves boxer, and a black belt in JuJitsu and Karate.
His book is definitely hard to put down once you start readin it. Even if you dont like Biography's, because he's got some great stories from being a Hell's Angel and being in prison for 6 years, as well as being a bodyguard of many stars. I highly recommend this book to anyone.