Book excerpt: Pulitzer Prize-winner David Halberstam's bestseller takes you inside the football genius of Bill Belichick for an insightful profile in leadership. Bill Belichick's thirty-one years in the NFL have been marked by amazing success--most recently with the New England Patriots. In this groundbreaking book, David Halberstam explores the nuances of both the game and the man behind it. He uncovers what makes Bill Belichick tick both on and off the field.