Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Dan Shea (born December 23, 1954 in Ontario) is a Canadian actor and stunt coordinator who is best known for his recurring role as Sgt. Siler on Stargate SG-1 and Stargate Atlantis. Shea was the stunt coordinator and Richard Dean Anderson's stunt double on the same series - Stargate SG-1. He previously served as Anderson's stand-in on MacGyver. He has appeared in episodes of three different series with Richard Dean Anderson: MacGyver, Stargate SG-1 and Stargate Atlantis. In Season 1, Episode 18 of Stargate SG-1; "Tin Man" he appeared as Colonel Jack O'Neill's (Richard Dean Anderson) 'clone'.