Robert J. McMahon is the Ralph D. Mershon Distinguished Professor of History, Emeritus, at Ohio State University and the Mershon Center for International Security Studies. A specialist in U.S. foreign relations, the Cold War, and the Vietnam War, he has long taught courses on those subjects. McMahon has also lectured widely in the United States as well as in China, Japan, India, South Korea, New Zealand, Singapore, Germany, Ireland, Great Britain, the Netherlands, and Finland. He is the author of several books, including Dean Acheson and the Creation of an American World Order (2009); The Cold War (2003); and The Limits of Empire: The United States and Southeast Asia since World War II (1999). He is also past president of the Society for Historians of American Foreign Relations.