Writing

1990

… Screenplay

1986

… Story

1985

… Screenplay

1984

… Writer

1980

… Screenplay

1979

… Screenplay

1977

… Writer

1973		The Paper Chase … Screenplay
1973		Carola … Teleplay

1972		Limbo … Screenplay
1972		When Michael Calls … Screenplay

1970		The Baby Maker … Writer
1970		Colossus: The Forbin Project … Screenplay

1966

… Screenplay

Directing

1988

… Director

1985

… Director

1984

… Director

1980

… Director

1979

… Director

1977

… Director

1973

… Director

1970

… Director

Acting

1968

1964

as Lord of the Forest

1958

as Dirk

1957		Johnny Trouble as Ike
1957		Invasion of the Saucer-Men as Bobby

Production

1985

… Producer

1984

… Producer