Mary John Miller served as the US Treasury’s under secretary for domestic finance from 2012 to 2014 where she oversaw Treasury debt management, fiscal operations, recovery from the financial crisis, and implementation of the Dodd-Frank financial reform legislation. From 2010 to 2012 she was assistant secretary for financial markets, where she was responsible for conducting Treasury auctions and monitoring all financial markets. She was confirmed by the US Senate to serve in both positions. On her retirement from the Treasury, Miller received the Alexander Hamilton Award for Distinguished Service. 

Before her public service, Miller spent 26 years in the investment management industry with the T. Rowe Price Group in Baltimore. She was the director of the Fixed Income Division from 2004 to 2009. She also served on the firm’s management committee and asset allocation committee, and as a trustee of the T. Rowe Price Foundation. In 2018, Miller was inducted into the Fixed Income Analysts Society Hall of Fame. Miller served as the interim senior vice president for finance and administration at Johns Hopkins University during the 2020–21 school year. 

Miller currently serves as a director of the Silicon Valley Bank Financial Group, T. Rowe Price Charitable, and the Baltimore Neighborhood Impact Investment Fund. In addition to her board position at the Urban Institute, she is a trustee of Johns Hopkins University and Calvert School. Miller is also a senior fellow at the Johns Hopkins University 21st Century Cities Initiative and serves on several nonprofit advisory boards. 

Miller earned a bachelor’s degree from Cornell University and a master’s in city and regional planning from the University of North Carolina at Chapel Hill. She is a chartered financial analyst.