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Donald Thomas Regan (December 21, 1918 – June 10, 2003) was the 66th United States secretary of the treasury from 1981 to 1985 and the White House chief of staff from 1985 to 1987 under Ronald Reagan. Regan studied at Harvard University before he served in the U.S. Marine Corps, achieving the rank of lieutenant colonel. In 1946, he began to work for Merrill Lynch, serving as its chairman and CEO from 1971 to 1980. Wikipedia