You cannot deny the versatility of this actor. He portrays his character exceptionally over the course of the show. With all the beautifully handled turnabouts of his personality as Bellick, he made it clear to the viewers that supporting actors shouldn't settle for mediocrity and can really outweigh performances of leads.
He may not have the looks to have a show of his own but he had the talent to be part of any show or movie in Hollywood. He is the real deal when it comes to acting not like some young celebrities around who are considered to be stars but not actors.