Gordon Freeman
Dr. Richard Keller (voiced by Brice Armstrong) is a Black Mesa scientist, working with Colette and Gina. He appears in "Half-Life: Decay". He is a 55-year-old, senior scientist in a wheel chair. He gives missions to Colette and Gina during the game. Keller also condemns Gordon Freeman and asks himself what Kleiner sees in him. His final fate is unknown.