Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Colazione da Tiffany | 1961 | |
| Actor | Invito a cena con delitto | 1976 | Lionel Twain |
| Writer | Suspense | 1961 | |
| Writer | A sangue freddo | 1967 | |
| Writer | Love, Marilyn | 2012 | |
| Writer | Il tesoro dell'Africa | 1953 | |
| Actor | Truman Capote - Enfant terrible der amerikanischen Literatur | 2016 | Truman Capote |
| Actor | The Rolling Stones: Cocksucker Blues | 1972 | Himself |
| Writer | Stazione Termini | 1953 | |
| Writer | Storie d'amore | 1995 |