Some of the supporting roles that I've done as an actor, I took them because I knew that I would get to watch some of the leading guys in the movies, and also I'd get to work with them.
And I have to credit David Jacobs with the opportunities he gave me. He was totally into sharing the creation of characters. David put together a show that told the story of people over many years' time and that was greatly enjoyable. Though nowadays that is frowned upon.