William Allen Young (born January 24, 1954) is an American actor and director who has starred in over 100 television, stage, and film projects, including two Academy Award-nominated films, A Soldier's Story and District 9. He is best known for his roles as Frank Mitchell on UPN's Moesha, Dr. Rollie Guthrie on the CBS medical drama Code Black, and as Judge Joseph Ratner on CBS's CSI Miami. His other television credits include ABC's The Day After, General Hospital, CBS's Madame Secretary, JAG, Atlanta Child Murders, and The Women of Brewster Place, among other shows. He is also credited with helping to diversity the ranks of writers, actors, directors and producers in Hollywood through the landmark 2000 TV Network Agreement, which he helped broker while serving as a former co-chair of the African-American Steering Committee of the Directors Guild of America.