Michael Moriarty (born April 5, 1941) is an American-Canadian stage and screen actor and a jazz musician. He received an Emmy Award, a Tony Award and Golden Globe Award. He is known for his first acting role on American television as a Nazi SS officer in the 1978 mini-series Holocaust.
Moriarty played Executive Assistant District Attorney Benjamin Stone for the first four seasons (1990–1994) on the television show Law & Order. Moriarty is also known for his roles in movies such as Bang the Drum Slowly, Who'll Stop the Rain, Q: The Winged Serpent, The Stuff, Pale Rider, Troll, Courage Under Fire, and Shiloh.