It's not fair, but we probably all think of Dennis Hopper as being an out-of-control wild man offscreen as well as on, but, while he certainly sowed his wild oats as well as anyone, he was also a careful craftsman as both actor and director.
One of the most interesting aspects of his career is the fact that, well before he grew his hair out and became a counterculture icon, he was an actor in big Hollywood movies with old-timers like Henry Hathaway and John Wayne.
In the following 1982 interview from John Gallagher's Director's Series, we get Hopper's unfiltered perspective about new Hollywood, old Hollywood, and his place in it all. It's pretty fascinating. Enjoy. Follow YouTube links for further sections of the interview.