There is more information available on this subject at Bruce Thomas on the English Wikipedia.

Bruce Thomas in Making Halo 4: A Hero Awakens.

Bruce Thomas (born May 17, 1961) is an American actor who performed the motion capture for John-117 in Halo 4. He also voiced Dr. Halsey's interrogator in the game's introductory cutscene and Ari Rezneck in Hunt the Truth. Thomas is perhaps best known for playing Batman in a series of commercials for the OnStar Corporation, a role he reprised in the short-lived Birds of Prey television series.