Almost Famous is so good, and Billy Crudup was great as Russell Hammond. According to his IMDB page Billy “does not want to be a star, he claims. He’s one of those constantly hard-working actors who’ll shoot the movie, and do as little publicity as he can.”
He’s done a pretty good job. I’ve seen 6 of his movies and wouldn’t be able to recognize him if I saw him on the street. Of course, one of those movies was Big Fish and I didn’t even remember that Danny Devito looked like this.