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 person to hold those positions having also led the White House Council of Economic Advisers and the first woman to hold either post. Wikipedia