He appeared as Gray Anderson on the CBS drama series Jericho.

He also appeared in the first season of The Sopranos as a compulsive gambler in trouble with Tony. He also has a recurring role in The Mentalist playing Director of CBI Gale Bertram.

He portrayed General Tommy Franks in the Oliver Stone film W. Gaston has appeared in over twenty films, including Sudden Death, Ransom, Cop Land, Thirteen Days, The Crucible, Double Jeopardy, High Crimes, Sugar and Body of Lies as well as the cop partner to Jimmy Smits in the movie Bless the Child.

The actor has also had roles in numerous TV dramas, including The Sopranos, The West Wing, Homicide: Life on the Street, Law & Order, Fringe, ABC's The Practice, and 24. He has appeared in comedies as well, including Ally McBeal and Malcolm in the Middle.

Gaston is now a regular on the CBS series Unforgettable as Det. Mike Costello.

Gaston has had various on and off Broadway roles, including A Day in the Death of Joe Egg on Broadway, Henry V, Landscape of the Body, and Fifty Ways with long time friend Vivienne Benesch.

Gaston is married with two children.

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