He received his bachelor's degree summa cum laude from Princeton University, won a Rhodes Scholarship to Oxford, and earned a Ph.D. in political science from Harvard. He has served as Assistant Secretary of Defense for International Security Affairs, Chair of the National Intelligence Council, and a Deputy Under Secretary of State. His most recent books include The Powers to Lead, The Future of Power, and Presidential Leadership and the Creation of the American Era. 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. In 2014, Japan awarded him the Order of the Rising Sun.