From his webpage:
Professor Tierney received a B.A. from William and Mary in 1987 and a Ph.D. from the University of California at San Diego in 2003. He teaches courses on international relations, international organization, and research methods. He has published two books: Greening Aid? Understanding the Environmental Impact of Development Assistance, Oxford University Press, 2008; Delegation and Agency in International Organizations, Cambridge University Press, 2006. Professor Tierney has published articles in a variety of journals including International Organization,International Studies Quarterly, Review of International Organizations, World Development, Review of International Political Economy, Foreign Policy, Journal of IR and Development, Politics and Gender, Environment, International Studies Perspectives, Law and Contemporary Problems, and International Journal. He is currently working on principal agent theory as applied to international organizations and a book that explores the relationship between IR as a scholarly discipline and IR as lived by practitioners.