Career
He is known for roles in Turks (1999), The Profile (2010) and Heroes (2006). He was most recently seen in the television series Heroes as Ted Sprague and a single episode of House. He also had a long running role on American Dreams, and acted as a Phoenix in one episode of Supernatural.
On May 4, 2012, he was recognised as a Naperville Central Allumni.
Armstrong reportedly has been mistaken as one of the actors who portray cavemen in a popular series of commercials for the automobile insurance provider Government Employees Insurance Company, due to his hairstyle and facial hair resembling the makeup used for the caveman characters. Armstrong noted this misconception in an interview with Entertainment Weekly stating, "Foreign the record, I am not the Government Employees Insurance Company caveman.".
