Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | The Crow - Die Krähe | 1994 | |
| Writer | Judge Dredd | 1995 | |
| Writer | RoboCop 2 | 1990 | |
| Writer | WarGames - Kriegsspiele | 1983 | |
| Writer | Eraser | 1996 | |
| Writer | Eraser | 1996 | |
| Writer | The Wild Bunch - Sie kannten kein Gesetz | 1969 | |
| Writer | The Wild Bunch - Sie kannten kein Gesetz | 1969 | |
| Producer | Sniper - Der Scharfschütze | 1993 | |
| Writer | Atemlos vor Angst | 1977 | |
| Writer | Grenzpatrouille | 1982 | |
| Writer | Solarfighters | 1986 | |
| Writer | Morituri | 1965 | |
| Writer | Hi-Lo Country - Im Land der letzten Cowboys | 1998 | |
| Writer | Das große Dings bei Brinks | 1978 | |
| Writer | L.A. Confidential | 2003 | |
| Writer | Strange New World | 1975 | |
| Writer | Without Warning | 1994 |