John T. O'Hagan

John T. O'Hagan (April 7, 1925 – January 2, 1991) was appointed the 22nd Fire Commissioner of the City of New York by Mayor John V. Lindsay on October 11, 1973, and served in that position throughout the Administration of Mayor Abraham D. Beame until he was replaced by incoming Mayor Edward I. Koch on January 17, 1978.

Biography O'Hagan joined the New York City Fire Department in 1947 at the age of 22, and quickly rose up the ranks. Appointed Chief of Department on December 16, 1964, at the age of 39, he was the youngest Fire Chief in FDNY history.

He was the author of High Rise/Fire & Life Safety in 1977 and was an international authority on fire administration and fire safety. He officially retired from the FDNY on July 18, 1978, after 31 years of service.

He died on January 2, 1991, in Brooklyn, New York, of cardiopulmonary arrest from cancer.

Family O'Hagan was married to Kaye Tully, had three children (Catherine, Susan and Michael) and ten grandchildren (Clare, Molly, Cecilia, Emily, Elizabeth, John, Daniel, Maggie, Joseph, and Michael).