But since 1970 he has made only a handful of films , none of them successful at the box office .
Penn established his reputation as a director with Bonnie and Clyde , one of the most significant and influential films of its decade .
Since 1970 Penn has made only a handful of films , none of them successful at the box office .
Penn established his reputation as a director with Bonnie and Clyde , one of the most significant and influential films of its decade .