Xander Berkeley

Alexander Harper "Xander" Berkeley (born December 16, 1955) is an American actor. He is known for his television roles of George Mason on the political thriller series 24, Percy Rose on the action thriller series Nikita and Sheriff Thomas McAllisteron the crime drama The Mentalist. He currently plays Gregory in AMC's The Walking Dead.

Filmography

 * Justice League: Knights of Rao - Commissioner James "Jim" Gordon (voice)
 * Teen Titans (Alternate Season 2) - Commissioner James "Jim" Gordon (voice)