Shaun Cassidy is an American television producer, screenwriter, actor, and singer. He was a teenage heartthrob of the ’70s. Cassidy released the albums Shaun Cassidy, Born Late, and Under Wraps. His most popular songs include Da Doo Ron Ron, That's Rock 'n' Roll, and Hey Deanie. Cassidy has appeared in the film Once Upon a Texas Train with Willie Nelson and the series The Hardy Boys/Nancy Drew Mysteries.