Brosan served as state police superintendent from Nov. 1, 1985 until April 22, 1987.
Before leading the state police, Brosan had worked in law enforcement for 26 years, including with the New York Police Department, the U.S. Customs Service and the U.S. Drug Enforcement Agency, incuding as deputy assistant administrator of the DEA.
Brosan was appointed Maryland State Police superintendent by Gov. Harry R. Hughes following the retirement of Wilbert T. Travers Jr.
The current Maryland State Police superintendent, Col. Marcus L. Brown, said in a statement that Brosan served "with a diligent commitment to excellence."
Brosan was later named a senior adviser to the state public safety secretary by Gov. Parris N. Glendening.