Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Il corvo - The Crow | 1994 | |
| Writer | Dredd - La legge sono io | 1995 | |
| Writer | RoboCop 2 | 1990 | |
| Writer | WarGames - Giochi di guerra | 1983 | |
| Writer | L'eliminatore | 1996 | |
| Writer | L'eliminatore | 1996 | |
| Writer | Il mucchio selvaggio | 1969 | |
| Writer | Il mucchio selvaggio | 1969 | |
| Producer | One Shot One Kill - A colpo sicuro | 1993 | |
| Writer | Il salario della paura | 1977 | |
| Writer | La frontiera | 1982 | |
| Writer | I guerrieri del sole | 1986 | |
| Writer | I morituri | 1965 | |
| Writer | The Hi-Lo Country | 1998 | |
| Writer | Pollice da scasso | 1978 | |
| Writer | L.A. Confidential | 2003 | |
| Writer | Strange New World | 1975 | |
| Writer | Without Warning | 1994 |