The son of Tony award winning actor Jack Cassidy and Academy award winner Shirley Jones (and half-brother of the late singer/actor David Cassidy), Shaun grew up in Los Angeles and New York City. While still in high school, he signed a contract with Warner Brothers records. This led to three multi-platinum albums and numerous top ten hits including "Da Doo Ron Ron", "That's Rock n' Roll", "Hey Deanie", and "Do You Believe In Magic?" Cassidy received a Grammy nomination for his efforts and performed at every major arena in the country including Houston’s Astrodome and New York’s Madison Square Garden. Almost concurrently, he starred in the ABC television series THE HARDY BOYS MYSTERIES. Later, while appearing on Broadway in the hit musical BLOOD BROTHERS, Shaun wrote his first television pilot, AMERICAN GOTHIC. When the show debuted, The New York Times called it “The most original new show of the season.�