He played agent Quinn on the show Prison Break, Gray Anderson on the CBS drama series Jericho, and appeared in the first episode of The Sopranos as Alex Mahaffey, a compulsive gambler in trouble with Tony.
[2] Gaston portrayed General Tommy Franks in W. 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 TV dramas, including The Sopranos, The West Wing, Homicide: Life on the Street, Law & Order, Law & Order: Special Victims Unit, Fringe, The Practice, and 24.
On October 10, 2017, during a wave of sexual assault allegations against several men in Hollywood, Gaston detailed in a series of tweets an incident in 1992 when the director of a play he was appearing in groped him sexually during a rehearsal.
He stated "I give the benefit of what little doubt I have to any woman who claims a powerful man treated her inappropriately.