Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Psyco | 1960 | |
| Writer | Psycho | 1998 | |
| Writer | Psycho II | 1983 | |
| Writer | Psycho IV | 1990 | |
| Writer | Cinque corpi senza testa | 1964 | |
| Writer | La casa che grondava sangue | 1971 | |
| Writer | La morte dietro il cancello | 1972 | |
| Writer | La morte dietro il cancello | 1972 | |
| Writer | Il Teschio Maledetto | 1965 | |
| Writer | Capitano Nemo: Missione Atlantide | 1978 | |
| Writer | Il giardino delle torture | 1967 |