Greenfield Police Department’s Detective Sergeant Justin Mattke represents leadership excellence and unwavering dedication to his team, department, and community. Since developing a passion for policing at 14 years old as a police explorer, Sgt. Mattke has pursued his passion for helping people and engaging with the community.  

Throughout his career, Det. Sgt. Mattke has exhibited remarkable leadership, fostering a culture of learning and empowerment. At the Monterey County Sheriff’s Office, Det. Sgt. Mattke spearheaded the creation of a Bakers to Vegas team, rallying support and enthusiasm among the members. After transitioning to the Greenfield Police Department, Det. Sgt. Mattke's leadership journey continued as he supervised the South Monterey County Task Force and became a part of the FBI Monterey Gang Unit and the DEA Gang and Narcotics Task Force.  

Det. Sgt. Mattke’s role as the lead liaison on two federal task forces also underscores his proactive approach to community safety. By leveraging federal resources and forging strategic partnerships, he brought federal police operations to historically underserved areas. He also helped provide opportunities for his colleagues to train and participate in complex federal investigations.  

Det. Sgt. Mattke’s leadership earned him the Medal of Meritorious Service for his pivotal role in supervising a juvenile homicide investigation and inspiring his entire investigation unit for going above and beyond under his leadership. Det. Sgt. Mattke also received the life-saving award in 2009 and the Officer of the Year Award for the City of Greenfield in 2017. 

Det. Sgt. Mattke draws motivation from his family and his fellow officers and strives to make the community a better place for everyone.  

“Leadership is being able to listen to people, understand their needs as a person, and help them achieve their goals.”