Hardy Boys Dynamite Magazine No. 41 1977 Shaun Cassidy Parker Stevenson Signed Autograph. Shaun Paul Cassidy (born September 27, 1958) is an American television producer/creator, screenwriter, actor, and former singer. He is the eldest son of Academy Award-winning actress Shirley Jones and Tony Award-winning actor Jack Cassidy. He has two younger brothers, Patrick and Ryan. His older half-brother is singer David Cassidy. Magazine has been signed on the cover by Shaun Cassidy and Parker Stevenson. magazine and autographs are in very good condition!