Harry Tunney Waters Jr. is an American actor, singer, and theatre director, best known for his portrayal of Marvin Berry in Back to the Future (1985) and Back to the Future Part II (1989). His renditions of "Night Train" and "Earth Angel" are two of the ten tracks on the gold record winning soundtrack album Back to the Future: Music from the Motion Picture Soundtrack. He created the role of Belize in the first production of Angels in America: A Gay Fantasia on National Themes in 1991.