At the age of 19 years old, Mick Fuller began his career at Kogarah Police station in 1987 as a junior officer, where he performed general and investigative duties. He joined the City of Sydney Investigations in 1992, where he later became a designated detective in 1993. He later joined the Crime Task Force in 1994 where he took up criminal investigative roles. Fuller became a Detective Sergeant in 2000 and led the drug squad at Kings Cross Police Station. In 2002, He became the Inspector Duty officer for the Eastern Beaches and later joined the Ashfield Target Action Group in 2003. Fuller was promoted to Superintendent Operations Manager for the Greater Metropolitan Region in 2004. In 2007, he became the Deputy Commissioner in charge of staff and field operations. Fuller was promoted as a Local Area Commander for the Eastern Suburbs in 2008 and for the City Central area in 2009. In 2010, he became the Assistant Commissioner and Commander of the Southern Region. Then, he was appointed Commander in charge of Professional Standards in 2013. While being the Assistant Commissioner in 2014, Fuller was also the Commander of the Central Metropolitan Region where he was part of the response team at the Lindt Cafe siege. He was selected as the New South Wales Police Commissioner in 2017.