Andrew J. Bacevich Jr. (/ˈbeɪsəvɪtʃ/, BAY-sə-vitch; born July 5, 1947) is an American historian specializing in international relations, security studies, American foreign policy, and American diplomatic and military history. He is a Professor Emeritus of International Relations and History at the Boston University Frederick S. Pardee School of Global Studies. He is also a retired career officer in the Armor Branch of the United States Army, retiring with the rank of colonel. He is a former director of Boston University's Center for International Relations (from 1998 to 2005), now part of the Pardee School of Global Studies. Bacevich is the co-founder and president of the Quincy Institute for Responsible Statecraft.