Patrick Thaddeus Jackson is Professor of International Studies and Chair of the Department of Global Inquiry in the School of International Service at American University in Washington, D.C. He is the author of one of the foundational (and award-winning) books on philosophy of science in international studies (The Conduct of Inquiry in International Relations), and has been working on problems related to knowledge and explanation for much of his career, including developing and teaching multiple courses for both undergraduate and graduate students. For approximately 15 years he also has taught philosophy of science and research design in short-term intensive graduate courses around the world for the European Consortium on Political Research, the International Political Science Association, and MethodsNET.