William Allen Young is an American actor best known for his role as Frank Mitchell on UPN's Moesha and directing a few episodes of the show, and made a guest appearance on UPN'sThe Parkers as Frank Mitchell. His other television credits include The Day After, Matlock, Babylon 5, CBS's JAG, Knots Landing, The Jeffersons, and The Women of Brewster Place, among other shows. He portrayed a recurring character on CBS's CSI: Crime Scene Investigation and a different recurring character on CBS's CSI: Miami. William currently plays Dr. Rollie Guthrie on the CBS medical drama Code Black.