Stephen Walter Stanton (born August 22, 1961) is an American voice actor and visual effects artist. His roles include Sasha Nein in Psychonauts and Psychonauts 2, Grand Moff Tarkin in the Star Wars franchise, Ben Kenobi in Star Wars Rebels (for the episode "Twin Suns"), Admiral Raddus in Rogue One and Griff Halloran on Star Wars Resistance. (Via Wikipedia)