William J. Bratton

William Joseph Bratton CBE is an American businessman and former law enforcement officer who served two non-consecutive tenures as the New York City police commissioner and currently one of only two NYPD commissioners to do so. He previously served as the Commissioner of the Boston Police Department (BPD) (1993–1994) and Chief of the Los Angeles Police Department (LAPD) (2002–2009). He is the only person to have led the police departments of the United States' two largest cities – New York and Los Angeles.