Joseph S. Nye Jr., University Distinguished Service Professor, Emeritus and former Dean of the Harvard's Kennedy School of Government.  He earned a PhD in political science from Harvard. He has served as  Assistant Secretary of Defense for International Security Affairs, Chair of  the National Intelligence Council, and Deputy Under Secretary of State  for Security Assistance, Science and Technology. His most recent books  include The Power to Lead; The Future of Power; Presidential Leadership and the Creation of the American Era; and Is the American Century Over.  He is a fellow of the American Academy of Arts and Sciences, the British Academy, and the American Academy of Diplomacy. In a recent survey of international relations scholars, he was ranked as the most influential  scholar on American foreign policy, and in 2011, Foreign Policy named  him one of the top 100 Global Thinkers.