
Robert Michael O'Hare Jr. (May 6, 1952 – September 28, 2012) was an American actor who performed on stage and television. He was best known for playing Commander Jeffrey Sinclair in the science fiction television series Babylon 5, a role he left due to serious mental health issues. Born in Chicago, Illinois. He attended Chicago's Mendel Catholic Preparatory High School, then studied at Harvard University, where he majored in English literature. He studied at the Juilliard School of Drama, and with Sanford Meisner.

C.H.U.D.
1984 · as Fuller

The Ambulance
1990 · as Hal

Babylon 5: The Gathering
1993 · as Cmdr. Jeffrey Sinclair

Last Exit to Brooklyn
1989 · as Riot Police Officer

Babylon 5: In the Beginning
1998 · as Lt. Cmdr. Jeffrey Sinclair (archive footage)

The Promise
1979 · as Ben Avery

By a Thread
1992 · as Quentin Springer

The Pursuit of D.B. Cooper
1981 · as Car Owner

Fly Away Home
1981

A Case of Deadly Force
1986 · as Joe Miller

Marciano
1979 · as Allie Columbo

Keefer
1978 · as Benny

Short-Term Bonds
1989 · as Bowers