Medium is an American supernatural and dramatic television series which premiered on NBC on January 3, 2005. Its focus is Allison DuBois (Patricia Arquette), who acts as a research medium for the Phoenix, Arizona district attorney's office. The lead character is a wife to loving husband, Joe, and the mother of three daughters who all inherited her gift, apparently passed from generation to generation. The original premise of the show was based on reported experiences from self-proclaimed spiritual medium Allison DuBois, who claims to have worked with law enforcement agencies across the country in criminal investigations. Medium was created by Glenn Gordon Caron and is produced by Picturemaker Productions and Grammnet Productions in association with CBS Television Studios, originally known as Paramount Television and CBS Paramount Television. The series aired on NBC during its first five seasons before switching to CBS, whose production division produces the show, beginning with the sixth season.