 He engaged in the marine insurance and shipping business.Cullen was a member of the New York State Assembly (Kings Co., 3rd D.) in 1896, 1897 and 1898.He was a member of the New York State Senate (3rd D.) from 1899 to 1918, sitting in the 122nd, 123rd, 124th, 125th, 126th, 127th, 128th, 129th, 130th, 131st, 132nd, 133rd, 134th, 135th, 136th, 137th, 138th, 139th, 140th and 141st New York State Legislatures.