Michelle Seitz is an American business executive and investor. She is the chairman and chief executive officer of Russell Investments. Seitz is one of few women in the world leading a global asset management firm. She is, according to Barron's, one of the "most influential women in U.S. finance". American Banker lists her as one of the "most powerful women in finance." Prior to her role at Russell Investments, she served on the board of William Blair & Company and as chief executive of William Blair Investment Management.