Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Dirty Harry | 1971 | |
| Writer | Das Boot | 1981 | |
| Writer | Ein Fremder ohne Namen | 1973 | |
| Writer | Dirty Harry kommt zurück | 1983 | |
| Writer | Der Unerbittliche | 1976 | |
| Writer | Sadistico | 1971 | |
| Writer | Coogans großer Bluff | 1968 | |
| Writer | Zwei ausgekochte Gauner | 1983 | |
| Writer | Der große Coup | 1973 | |
| Writer | Fatal Beauty | 1987 |