Michael Ray Dibdin Heseltine, Baron Heseltine, CH, PC (born 21 March 1933) is a British businessman, Conservative politician and patron of the Tory Reform Group. He was a Member of Parliament from 1966 to 2001, and was a prominent figure in the governments of Margaret Thatcher and John Major. In 1990 he stood for the leadership of the Conservative Party against Margaret Thatcher and, while he was unsuccessful, his standing triggered Thatcher's eventual resignation.