Actor and director Dennis Hopper, who died 15 years ago on May 29, 2010, at the age of 74, is largely remembered today as one of the fathers of edgy, boundary-pushing American cinema. After making his film debut in 1955 with a small role in Rebel Without a Cause, the Actors Studio-trained Hopper went on to write, direct and star in the generation-defining Easy Rider, and appear in similarly edgy films like River’s Edge, Blue Velvet, and Basquiat. He also made a name for himself as a character actor in major Hollywood films like Hoosiers and Speed.

But before he was considered one of Hollywood’s most iconic rebels, Hopper got his career going with a decade-long period in which he largely appeared as a guest star on TV Westerns.