Admiral Mullen was the Chairman of the Joint Chiefs of Staff of the United States (2007-2011) and principal military advisor to both President George W. Bush and President Barack Obama.

He served on the corporate boards of General Motors from 2013-2018 and Sprint from 2013-2019.

Admiral Mullen continues to serve on numerous boards including Bloomberg Philanthropies, CALTECH, Harvard Business School, Various Naval-associated foundations, and a wide array of non-profit organisations dedicated to improving the growth, development, recovery, and transition of military veterans and their families.