Lowell Police Department Davis served on the
Lowell Police Department from 1978 to 2006 when he was appointed Commissioner of the Boston Police Department. He held the positions of
beat cop, Detective (1982–1984), Detective Sergeant (1984–1986) and Detective Lieutenant (1986–1992), before being promoted to Captain of the Narcotics and Organized Crime Unit in 1992. He was named Superintendent of Police, the highest-ranking officer in the Lowell Police Department in 1994. From 1994 to 1999, he reduced the crime rate in
Lowell quicker than any other American city with over 100,000 residents.
Boston Police Department in 2009 in 2013 Davis was appointed the commissioner of the Boston Police Department on October 11, 2006.
Later involvement In 2022, Davis served on a panel appointed by Boston Mayor
Michelle Wu to aid in the search for a commissioner of the Boston Police Department. ==Personal life==