Jack Cassel, American baseball player
Joseph "Jack" Buren Cassel II (born August 8, 1980) is a former Major League Baseball pitcher for the San Diego Padres and Houston Astros organizations. He retired from professional baseball in 2010 after suffering a career ending shoulder injury. He now runs the Listings and Capital Markets group for Nasdaq. In addition, he is a co-founder and board member of Players for the Planet, a non-profit organization that utilizes professional athletes to promote and inspire environmental awareness.