Davis has been in law enforcement for 35 years. He served as the Police Commissioner of the City of Boston from December 2006 until October 2013. He administered 6 world championship celebrations and led the highly successful response to the Boston Marathon bombing. Prior to that, Davis was the Superintendent of the Lowell Police Department, a position he held for 12 years and one he rose to after starting out as a patrol officer in 1978. He comes from a police family, which has allowed him to better understand the needs of police officers and the communities they serve. He is a recognized expert in crisis management and community policing. He brings with him a strong record of interagency collaboration and a broad range of local, state, national and international experience in law enforcement and public safety.