Michael C. Horowitz is an associate professor of political science at the University of Pennsylvania.  His first book, titled The Diffusion of Military Power: Causes and Consequences for International Politics, was published by Princeton University Press. It won the Furniss Award given by the Mershon Center for International Security Studies given to a first time author writing about national or international security. The book also won the Best Book Award given by the International Security Studies section of the International Studies Association.

His primary research revolves around international conflict and security issues.  He is also interested in the intersection of religion and international relations, the role of leaders in international politics, and international security issues in East Asia.  Professor Horowitz spent the 2010-2011 academic year on leave due to a grant from the Smith Richardson Foundation. He spent the 2006-2007 academic year as a postdoctoral fellow at the Belfer Center for Science and International Affairs at Harvard University.  He completed his PhD in the Department of Government at Harvard University, where his dissertation examined the diffusion of military power and the consequences for international politics. His other academic projects include studies of how attributes of international leaders influence their decision-making concerning international conflict, the empirical impact of weapons of mass destruction proliferation on international behavior, North Korean negotiating patterns, and U.S.-Australian relations.  Professor Horowitz was the Sidney R. Knafel Fellow at the Weatherhead Center for International Affairs in 2005–2006. During the 2004–2005 academic year, Professor Horowitz was a predoctoral fellow at the Olin Institute for Strategic Studies at Harvard. He has previously worked at Science Applications International Corporation and at the Center for Strategic and International Studies as a Research Assistant in the International Security Program. He has also served as a consultant on national security topics in Washington, DC  His work has been published in International Organization, The Journal of Conflict Resolution, The Journal of Strategic Studies, Orbis, and The Washington Quarterly, among other journals.

His teaching interests include courses on warfare, religion, the international security environment, and the use of statistics to study international conflict.