Garreth Miller’s first job as an Emergency Medical Technician was on a Basic Life Support ambulance. In 1996, he became a firefighter with the City of Stockton and soon after obtained his paramedic license. He joined the San Francisco Fire Department in 2000 and has served at many stations across the city. His most recent fire suppression assignment was at Battalion 3.

Chief Miller has deployed to mutual-aid fires throughout the state and has served as a canine handler on California Task Force 3, one of the 28 Federal Emergency Management Agency Urban Search and Rescue teams. Prior to his current role, he was the Assistant Deputy Chief for Earthquake Safety and Emergency Response Projects, overseeing the bond‑financed capital projects of the San Francisco Fire Department.