For anyone interested in learning more about Bill, I highly recommend Belichick: The Making of the Greatest Football Coach of All Time by Ian O’Connor.
It gives an in depth look at the upbringing of Belichick as a kid, college student, and his early coaching days. The books takes you through his high and lows and helps you get a better understanding of why Belichick was the way he was. It is unbiased and neither attacks nor hypes up Bill. As a Pats fan, I absolutely loved it, but I think any football fan would enjoy it.
Wheelhouse Blog 