Vincent Dunn served 42 years with the New York City Fire Department and rose up through the ranks of the department: seven years as a firefighter, nine years as a company officer and 26 years as a chief officer. From 1984 to 1999, he was commander of Division 3, in charge of fire protection and fire prevention in Midtown Manhattan, the high-rise, high-value district of New York City, with a staff of 600. He developed and coordinated New York City seminars on high-rise firefighting, terrorism tactics, collapse rescue operations. Developed and supervised crew size, hose stretching research at Division of Training FDNY. He retired as a Deputy Chief of the FDNY in 1999.