William Katt is an American actor best known for his role as Ralph Hinkley in the television series The Greatest American Hero, which aired from 1981 to 1983. Born on February 16, 1951, in Los Angeles, California, Katt has appeared in various films and television shows throughout his career, showcasing his versatility as an actor. In addition to his acting career, Katt is also a producer and director. He has worked on several projects, including the horror film House in 1986, where he played the lead role. Katt's contributions to the entertainment industry have made him a recognizable figure in both television and film.