Donald Thomas `` Don '' Regan ( December 21 , 1918 - June 10 , 2003 ) was the 66th United States Secretary of the Treasury , from 1981 to 1985 , and Chief of Staff from 1985 to 1987 in the Ronald Reagan Administration , where he advocated `` Reaganomics '' and tax cuts to create jobs and stimulate production .
He was the 66th United States Secretary of the Treasury from 1981 to 1985 under the Ronald Reagan administration .