Hester Maria Peirce is an American lawyer who serves as a Commissioner on the Securities and Exchange Commission (SEC). She previously served as the director of the Financial Markets Working Group at George Mason University's Mercatus Center. Peirce was confirmed by the United States Senate in December 2017 to fill a Republican vacancy on the SEC. She was sworn in on January 11, 2018, for a term ending in 2020, and her second term expires in 2025. Peirce is a former staff member of the United States Senate Committee on Banking, Housing, and Urban Affairs and of the SEC. In 2016, she was nominated by President Barack Obama for Commissioner on the SEC, but the United States Senate did not act on her nomination.