Dallas Roberts is primarily based in New York City, where he regularly appears in theatrical productions. Off-Broadway he has appeared in a revival of Lanford Wilson's "Burn This," opposite Edward Norton and Catherine Keener; in Adam Rapp's "Nocturne," for which he was nominated for a Drama Desk Award; and in Caryl Churchill's "A Number," opposite Sam Shepard and later Arliss Howard, among others. He was slated to make his Broadway debut as Tom Wingfield in a revival of Tennessee Williams' "The Glass Menagerie" opposite Jessica Lange and Josh Lucas, but was replaced by Christian Slater during rehearsals.

Roberts' film work includes the screen adaptation of Michael Cunningham's "A Home at the End of the World," opposite Colin Farrell and Robin Wright Penn, and supporting roles in "Walk the Line" and "The Notorious Bettie Page," among others. He also had a regular role on the Showtime drama "The L Word."

He starred in the AMC original series "Rubicon" as Miles Fiedler, a genius intelligence analyst at a national think tank. He has guest starred in nine episodes of the CBS series "The Good Wife" as the brother of the character Alicia Florrick, played by Julianna Margulies.

Roberts as appeared in the hit AMC television show "The Walking Dead," playing scientist Milton Mamet, who studies "walkers" (zombies).

Walking Dead