Donald Thomas "Don" Regan (December 21, 1918 – June 10, 2003) was the 66th United States Secretary of the Treasury, from 1981 to 1985, and White House 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. Before serving in the Reagan administration, Regan served as Chairman and CEO of Merrill Lynch from 1971 to 1980.