Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Requiem for a Dream | 2000 | Party Animal |
| Writer | Omen - Il presagio | 1976 | |
| Writer | Due nel mirino | 1990 | |
| Writer | Omen - Il Presagio | 2006 | |
| Writer | Il segno della libellula - Dragonfly | 2002 | |
| Writer | Omen II - La maledizione di Damien | 1978 | |
| Writer | Omen III - Conflitto finale | 1981 | |
| Writer | Omen IV - Presagio infernale | 1991 | |
| Director | Lucas | 1986 | |
| Writer | Lucas | 1986 | |
| Director | Vite sospese | 1992 | |
| Writer | Vite sospese | 1992 | |
| Producer | Vite sospese | 1992 | |
| Director | L'ultima battuta | 1988 | |
| Writer | L'ultima battuta | 1988 | |
| Writer | Profezia | 1979 | |
| Writer | My Giant | 1998 | |
| Writer | My Giant | 1998 | |
| Writer | Cinema Verite | 2011 | |
| Actor | 666: The Omen Revealed | 2000 |