Son of Dennis and Jennie Sullivan. Attended Peekskill Military Academy at Peekskill, New York and entered Harvard University as a special student in 1893. Studied law then entered business in connection with Denver Consolidated Gas Company. Originally member Troop B, Colorado National Guard. Discharged 3/9/1898 and became 1st Lieutenant in Company I, 1st United States Volunteer Engineers. Died of fever contracted in Puerto Rico.