Keith Szarabajka (Polish: [ʂaraˈbajka]; born December 2, 1952) is an American actor. He is best known for his roles as Mickey Kostmayer on The Equalizer, Daniel Holtz on Angel, Gerard Stephens in The Dark Knight and Adam Engell in Argo. He has also voiced Dr. Terrence Kyne in Dead Space, Major General Spencer Mahad in Dead Space 3, Joshua Graham in Fallout: New Vegas, Harbinger in Mass Effect 2, Detective Herschel Biggs in L.A. Noire and the Didact in Halo 4. (Via Wikipedia)