Shaun Paul Cassidy (born September 27, 1958 in Los Angeles, California) is an American singer, actor and TV producer and writer. The oldest of three sons born to Shirley Jones and Broadway entertainer/television star Jack Cassidy, he first found success as a teen idol, following in the footsteps of his elder half-brother, David Cassidy of TV's The Partridge Family. He went to Beverly Hills High School. He released several successful singles in the late 1970s.