William Bratton

William Joseph Bratton CBE (born October 6, 1947) is an American businessman and former law enforcement officer who served two non-consecutive tenures as the New York City Police Commissioner (1994–1996 and 2014–2016) and currently one of only two NYPD commissioners to do so (the other is Raymond Kelly). 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.

Bratton began his police career at the BPD before becoming police commissioner in New York, where his quality-of-life policy has been credited with reducing petty and violent crime. He was recruited to lead the LAPD in 2002, following a period when the LAPD was struggling to rebuild public trust after a series of controversies in the 1990s. Bratton presided over an era of reform and crime reduction. In January 2014, Bratton returned to the post of police commissioner in New York, and served until September 2016.

Bratton has served as an advisor on policing in several roles, including advising the British government and is currently the chairman of the Homeland Security Advisory Council for the U.S. government.

Bratton's policing style is influenced by the broken windows theory, a criminological theory of the norm-setting and signaling effect of urban disorder and vandalism on additional crime and anti-social behavior. He advocates having an ethnically diverse police force representative of the population, being tough on gangs and maintaining a strict zero tolerance policy toward anti-social behavior.