American politician and grandson of the oil magnate John Rockefeller (1839-1937) John Davison (J) Rockefeller IV died at the age of 89 - The Washington Post newspaper Rockefeller was elected to the Senate in 1984 and at various times chaired the Senate Committees on Commerce, Science and Transportation, the Committee on Veterans Affairs and the Intelligence Committee. In 2008, he led a bipartisan Senate investigation into the events leading up to the Iraq War. His great grandfather John Rockefeller was the founder of the oil industry syndicate Standard Oil and was one of the first billionaires in the world.