<P> 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, Sarah Paulson and Josh Lucas, but was replaced by Christian Slater during rehearsals . </P> <P> Roberts' film work includes the screen adaptation of Michael Cunningham's A Home at the End of the World, and supporting roles in Walk the Line and The Notorious Bettie Page, among others . He 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 made guest appearances in twelve episodes to date on The Good Wife . He has also made many appearances on Law & Order and its spinoff, Law & Order: Special Victims Unit . </P> <P> From August 2012 through March 2013, Roberts was in the cast of The Walking Dead as scientist Milton Mamet, who studies "walkers" (zombies). From 2013 - 15, he played Eliot Delson on Unforgettable . </P> <P> Roberts is married to scenic designer Christine Jones; the couple has two children . </P>

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