Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Mission: Impossible | 1996 | |
| Writer | Mission: Impossible 2 | 2000 | |
| Writer | Armageddon - Giudizio finale | 1998 | |
| Writer | Gangster Story | 1967 | |
| Writer | Chinatown | 1974 | |
| Writer | Giorni di tuono | 1990 | |
| Writer | Il socio | 1993 | |
| Writer | Allarme rosso | 1995 | |
| Writer | Greystoke - La leggenda di Tarzan, il signore delle scimmie | 1984 | |
| Writer | Frantic | 1988 | |
| Writer | L'orca assassina | 1977 | |
| Director | Tequila connection | 1988 | |
| Writer | Tequila connection | 1988 | |
| Actor | Ehi... ci stai? | 1987 | Stan |
| Writer | L'ultima corvè | 1973 | |
| Writer | Chiedi alla polvere | 2006 | |
| Director | Chiedi alla polvere | 2006 | |
| Writer | Il grande inganno | 1990 | |
| Writer | Shampoo | 1975 | |
| Writer | Yakuza | 1974 | |
| Director | Due donne in gara | 1982 | |
| Writer | Due donne in gara | 1982 | |
| Writer | Love affair - un grande amore | 1994 | |
| Writer | 8 milioni di modi per morire | 1986 | |
| Writer | La tomba di Ligeia | 1964 | |
| Director | Without Limits | 1998 | |
| Writer | Without Limits | 1998 | |
| Actor | The Zodiac Killer | 1971 | Man in Bar #3 (as Robert Tubin) |
| Actor | Creatura del mare fantasma | 1961 | Sparks Moran / Agent XK150 / Narrator |
| Writer | Viva! Viva Villa! | 1968 |