Rachel Ellehuus is deputy director and senior fellow with the Europe, Russia, and Eurasia Program at the Center for Strategic and International Studies (CSIS). Her research focuses on the future of NATO; the transatlantic relationship; U.S.-European Union relations; and regional security and defense dynamics, particularly in Northern Europe and the Arctic. Before coming to CSIS, she served as principal director for European and NATO Policy in the Office of the Secretary of Defense at the U.S. Department of Defense. From 2009 to 2012, Ms. Ellehuus was based in London, assigned to the Strategy Unit in the UK Ministry of Defense. Prior to her work at the Department of Defense, Ms. Ellehuus was a researcher at the Danish Institute of International Affairs and lived in Prague, Czech Republic, where she worked at the EastWest Institute. She holds a B.A. in international relations and German from Colgate University and an M.A. in political science and European affairs from the College of Europe (Bruges/Natolin).