Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Il dottor Stranamore, ovvero: come ho imparato a non preoccuparmi e ad amare la bomba | 1964 | |
| Writer | Easy Rider | 1969 | |
| Writer | Barbarella | 1968 | |
| Writer | Cincinnati Kid | 1965 | |
| Writer | The Magic Christian | 1969 | |
| Writer | The Magic Christian | 1969 | |
| Writer | Piano piano non t'agitare | 1967 | |
| Writer | Il caro estinto | 1965 |