Mareike Kleine joined the European Institute in September 2009. Her research interests include theories of international organisation and International Political Economy, informal and formal governance, the interplay of domestic politics and international institutions, negotiation theories and normative questions of global governance. Her book Informal Governance in the European Union (Cornell University Press 2013) shows how informal norms in the EU and other international organizations serve as a means to provide discretion to states facing unexpected domestic political shocks. Other work has appeared in journals such as International Theory, Journal of Common Market Studies, Journal of European Public Policy, and the Review of International Organizations.

Mareike has held visiting positions at Princeton University’s European Union Program, Harvard University's Center for European Studies, and the University of St Gallen. She completed her PhD in political science at Freie Universitt Berlin (2009). Her doctoral thesis won her the Theseus Award for Promising Research on European Integration as well as the Ernst B. Haas Best Dissertation Award of the American Political Science Association.