Scenarist
- Red Dawn (2012)
- Rome (2005)
- Clear and Present Danger (1994)
- Farewell to the King (1989)
- Red Dawn (1984)
- Conan the Barbarian (1982)
- Apocalypse Now (1979)
- Big Wednesday (1978)
- The Wind and the Lion (1975)
- Dillinger (1973)
- The Life and Times of Judge Roy Bean (1972)
- Dirty Harry (1971)
Filmografie - altele
