Geoffrey Quentin McCaully Hubbard (January 6, 1954 – November 12, 1976), was the son of Scientology founder L. Ron Hubbard and his third wife, Mary Sue Hubbard. He died at the age of 22 in an apparent suicide.After Ron's eldest son Ron Jr. quit Scientology in 1959, Ron chose Quentin as his successor to lead the organization. Quentin went to sea with Ron when he established the Sea Organization, living on the flagship Apollo and reaching the highest level of auditor training.