Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Terminator 2 - Il giorno del giudizio | 1991 | |
| Writer | Terminator | 1984 | |
| Writer | Die Hard - Duri a morire | 1995 | |
| Writer | Die Hard - Vivere o morire | 2007 | |
| Writer | Dredd - La legge sono io | 1995 | |
| Writer | Nightmare 5 - Il mito | 1989 | |
| Writer | Il 13° guerriero | 1999 | |
| Writer | Codice Mercury | 1998 | |
| Writer | L'esorcista - La genesi | 2004 | |
| Writer | L'eliminatore | 1996 | |
| Writer | Nome in codice: Broken Arrow | 1996 | |
| Writer | I.T. - Una mente pericolosa | 2016 | |
| Writer | Dominion: Prequel to the Exorcist | 2005 | |
| Writer | Pumpkinhead | 1988 |