Born in Brooklyn, NY, Chief O'Malley, along with his family of 13 brothers and sisters, moved to Plandome at the age of 12. In 1976, while attending high school, Bryan joined the Plandome Fire Department and remained a member for three years.

In February of 1980, Bryan joined Manhasset-Lakeville Fire Department Company #2. In 1986, he was elected as a Company Line Officer and moved up the ranks from 2nd Lieutenant, 1st Lieutenant and finally served as Captain from 1990-1992.

Bryan is a charter member of the 8th Battalion Dive Team, a charter and honorary member of the M-LFD Ambulance Unit, a Legislative Chairman for the Department, past-Chairman of the Department's Blood Bank and the Company New Truck Committee.

Chief O'Malley has been a Certified New York State Emergency Medical Technician since 1976, and is an Emergency Medical Specialist for the New York City Fire Department's Emergency Medical Services since 1981. He was assigned to Coney Island, Brooklyn for 18 1/2 years. In the spring of 2007, Bryan was promoted to the rank of Lieutenant in the FDNY Bureau of EMS.

Two of Chief O'Malley's brothers have been volunteer firefighters within the 8th Battalion. He lives with his wife Kathy and son Bryan. Bryan is proud that his brother Neil is a member of the Garden City Fire Department since August of 1999. Most recently, Bryan's son, Bryan Jr., became a member of the Albertson Fire Department.

Bryan was elected 4th Deputy Chief in 1999, and was elected Chief of Department on August 4th, 2006.