Ms. Stonesifer served as the President and CEO of Martha’s Table, a non-profit, from April 2013 to March 2019. She served as Chair of the Board of Regents of the Smithsonian Institution from January 2009 to January 2012 and as Vice Chair from January 2012 to January 2013. From September 2008 to January 2012, she served as senior advisor to the Bill and Melinda Gates Foundation, a private philanthropic organization, where she was Chief Executive Officer from January 2006 to September 2008 and President and Co-chair from June 1997 to January 2006. Since September 2009, she has also served as a private philanthropy advisor. From 1988 to 1997, she worked in many roles at Microsoft Corporation, including as a Senior Vice President of the Interactive Media Division, and also served as the Chairwoman of the Gates Learning Foundation from 1997 to 1999.
Ms. Stonesifer has served as a trustee of The Rockefeller Foundation, a private foundation dedicated to promoting the well-being of humanity throughout the world, since 2019, as an emeritus member of the Museum Council of the Smithsonian National Museum of African American History and Culture since 2021, and as a member of the Museum Council from 2012 to 2020. Ms. Stonesifer has been a member of the Board of Advisors of TheDream.US, a college access and success program for immigrant students, since 2020.