Janet Yellen (Wikipedia) Janet Louise Yellen (born August 13, 1946) is an American economist, currently 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. She is the first woman to hold either post, and has also led the White House Council of Economic Advisers. Yellen is the Eugene E. and Catherine M. Trefethen Professor of Business Administration and Economics at the University of California, Berkeley.