R. Nicholas Burns, formerly the highest-ranking career diplomat at the U.S. Department of State, has been appointed Professor of the Practice of Diplomacy and International Politics. He will serve on the Board of Directors at Belfer Center.

The days of American hegemony on the world stage appear to be waning. The rise of other global powers, the diffusion of economic and human capital, and the increasingly powerful influences being exerted by non-state actors — including terrorists — have ushered in a new era in geopolitics. Joseph Nye is university distinguished service professor and Sultan of Oman professor of international relations. He is the author of many books and articles on international relations, including his most recent book, “The Powers to Lead.”