Served as U.S. Ambassador to NATO from 2008 to 2009, and was a career member of the U.S. Senior Foreign Service, with almost 30 years of experience working on European political and security issues under five U.S. Administrations. Currently, Ambassador Volker serves as Executive Director of The McCain Institute for International Leadership, a part of Arizona State University based in Washington, DC. He is also a non-resident Senior Fellow at the Center for Transatlantic Relations at Johns Hopkins University’s School of Advanced International Studies, a Senior Advisor at the Atlantic Council, and a Trustee of IAU College in Aix-en-Provence, France. He is a consultant to international business, a member of the Board of Directors of Capital Guardian Funds Trust, and had previously served as Managing Director – International for BGR Group. He has taught Transatlantic Relations at The George Washington University Elliott School of International Affairs.