Dennis has been acting on stage, television and film for over two decades. On television he has appeared on Law & Order, Law & Order: Criminal Intent, The Sopranos and in multiple roles on a number of New York based soap operas. He also played a minor role in Ang Lee's award winning The Ice Storm. Equally adept at comedy and drama, he has performed in many Regional and Off-Off-Broadway theatres playing lead roles in such plays as The Taming of the Shrew, Oedipus Rex, True West, Luv and others. He has been a member of Red Earth Ensemble and, most recently, The Drilling Company working out of the 78th Street Theatre Lab.