Mary Beth Long is an American foreign policy expert, entrepreneur, and former U.S. Government official. From 2007–2009, Long served as the first woman confirmed by the U.S. Senate as an Assistant Secretary of Defense, and as such, was the first female civilian four-star military equivalent in the history of the Pentagon. She led the International Security Affairs (ISA) office in the Office of the Secretary of Defense responsible for policy for the Middle East, Europe, and Africa. She was also the first woman ever to be appointed as Chair of NATO's High Level Group (HLG), the highest-level responsible for NATO's nuclear policy and reporting directly to the Secretary General of NATO.