Actor Erwin is an American actor who has been in the entertainment industry for over two decades. He is best known for his roles in films such as 'The Departed' and 'The Wolf of Wall Street'. His stage name is STU, which is a three-letter acronym for his full name, and his nickname is STUS, which is a four-letter acronym for his full name. He has also appeared in television shows such as 'Law & Order: SVU' and 'The Good Wife'.