Bill Bratton has been chief of the Los Angeles Police Department, chief of the New York City Transit Police, commissioner of the Boston Police Department, and New York City Police Department commissioner twice. For the last twenty-five years, he has been one of the most high profile police leaders in America. We talk about his career and his new book (written with Peter Knobler) "The Profession: A Memoir of Community, Race, and the Arc of Policing in America"