An ally of Ann W. Richards, the state’s last Democratic governor, who appointed him to the University of Texas Board of Regents in 1991.
His contributions to George S. McGovern’s 1972 presidential campaign put Mr. Rapoport on one of President Richard M. Nixon’s enemies lists; contributions to the presidential campaigns of both Bill and Hillary Rodham Clinton helped nourish a 40-year friendship. Mr. Clinton is scheduled to deliver a eulogy at a memorial service next month in Washington.
Ralph Nader, the consumer advocate, called Mr. Rapoport one of the most progressive corporate executives in the country.
In 1951, he borrowed $25,000 and founded the American Income Life Insurance Company, which marketed itself to labor unions and their members.
He gave millions to the University of Texas for scholarships, and endowed chairs and professorships that focused on human rights and ethics. He gave to causes in Israel that sought accommodation with the Palestinians.
Mr. Rapoport also supported liberal publications like The Nation and The Texas Observer.
Besides his granddaughter Abby, Mr. Rapoport is survived by his wife; his son, Ronald; and another granddaughter, Emily Rapoport.