From Wikipedia, the free encyclopedia. Sam Rockwell (born November 5, 1968) is an American actor known for his leading roles in Lawn Dogs, Confessions of a Dangerous Mind, Choke and Moon, as well as for his supporting roles in The Green Mile, Iron Man 2, The Hitchhiker's Guide to the Galaxy, Frost/Nixon, Galaxy Quest, Matchstick Men, The Assassination of Jesse James by the Coward Robert Ford and Conviction. Description above from the Wikipedia article Sam Rockwell, licensed under CC-BY-SA, full list of contributors on Wikipedia.