Career
He played agent Quinn on the show Prison Break. He appeared as Gray Anderson on the Columbia Broadcasting System drama series Jericho. He also appeared in the first season of The Sopranos as a compulsive gambler in trouble with Tony.
He also had a recurring role in The Mentalist as China, Burma, India Theatre of Operations Director Gale Bertram.
Gaston portrayed General Tommy Franks in West. He has appeared in more than twenty films, including Bridge of Spies, Sudden Death, Ransom, Cop Land, Thirteen Days, The Crucible, Double Jeopardy, High Crimes, Sugar and Body of Lies and Bless the Child.
He has had roles in numerous television dramas, including The Sopranos, The West Wing, Homicide: Life on the Street, Law & Order, Law & Order: Special Victims Unit, Fringe, The Practice, and 24. Gaston has had various on and off Broadway roles, including A Day in the Death of Joe Egg (on Broadway), as well as Henry V, Landscape of the Body, and Fifty Ways (all off-Broadway). Gaston is married with two children.