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Janet Louise Yellen (born August 13, 1946) is an American economist serving as the 78th United States secretary of the treasury since January 26, 2021. She previously served as the 15th chair of the Federal Reserve from 2014 to 2018. Yellen is the first woman to hold each of those posts and the first person to have led the White House Council of Economic Advisers, the Federal Reserve, and the Treasury Department.