Kevin J. Mullen served for 26 years in the San Francisco Police Department, retiring from the position of deputy chief. He has written extensively about the San Francisco criminal justice system.

He is the author of four books. Let Justice Be Done: Crime and Politics in Early San Francisco, The Toughest Gang in Town: Police Stories From Old San Francisco, and Dangerous Strangers: Minority Newcomers and Criminal Violence in the Urban West 1850-2000.  Chinatown Squad: Policing the dragon from the gold rush to the 21st Century.

From its formal founding as an American city in 1850 and to the present, San Francisco has suffered 7000 criminal homicides. This website contains information about books, articles, and databases on those homicides and related criminal justice topics.

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