Mary Sue Hubbard, née Whipp; June 17, 1931 – November 25, 2002) was the third wife of L. Ron Hubbard, from 1952 until his death in 1986. She was a leading figure in Scientology for much of her life. The Hubbards had four children; Diana (born 1952), Quentin (born 1954), Suzette (born 1955), and Arthur (born 1958).She became involved in Hubbard's Dianetics in 1952, while still a student at the University of Texas at Austin, becoming a Dianetics auditor.