The Greenfield Police Department is currently led Chief of Police Guillermo Mixer.
Mixer started his law enforcement career with the Los Angeles Police Department in 1995, and as a young officer worked patrol in North Hollywood, Rampart, and the 77th Street Division. It was at the 77th Street Division, in South Central Los Angeles, that Mixer spent most of his career. He moved from patrol, gang officer, detectives, and then to the South Bureau Criminal-Gang Homicide Division where he worked on several federal task forces with the FBI, ATF, DEA, and the Secret Service.
Mixer retired from the LAPD in 2014, moved to Monterey County, and worked for the Monterey County District Attorney’s Office, moving through the various investigation units and positions, including Interim Captain. In early 2021, Chief Greg Allen recruited Mixer to join the Greenfield Police Department as a Sergeant, then he was promoted to Captain in September 2021. Shortly after, he stepped in as Acting Police Chief for Chief Allen and spent 17 months as the Acting Police Chief.
Mixer holds a Bachelor of Science in Criminal Justice and a Master of Science from the University of San Diego in Law Enforcement and Public Safety Leadership. Mixer also received a Professional Certificate in Management from the University of Notre Dame.