Attended Santa Clara (California) College
Father, with actress Marguerite Churchill, of writer Darcy O'Brien.
Father, with Churchill, of Orin O'Brien who has played bass with the New York Philharmonic since 1966.
Grandfather of Molly O'Brien
O'Brien served in the US Navy in World War I, and was decorated several times for bravery under fire.
Son of San Francisco police chief Daniel J. O'Brien and his wife Margaret Donohue.
U.S. Navy Pacific Fleet light-heavyweight boxing champion, 1918.
Was a guest at the 1980 Memphis Film Festival.