Janet Louise Yellen (born August 13, 1946) is an American economist serving as the 78th United States secretary of the treasury<!--DO NOT CHANGE CAPITALIZATION – SEE MOS:JOBTITLE--> since January 26, 2021. She previously served as the 15th chair of the Federal Reserve<!--See MOS:JOBTITLES – "chair" should not be capitalized--> from 2014 to 2018. She is the first woman to hold either post, and has also led the White House Council of Economic Advisers. Wikipedia