Turkuler Isiksel is Assistant Professor at the Department of Political Science at Columbia University. She earned her PhD in political science from Yale University and works primarily in contemporary political theory. Isiksel has served as a Perkins fellow at the Princeton University Program in Law and Public Affairs and as an Emile Noël Fellow at the Jean Monnet Centre for International and Regional Economic Law and Justice at the New York University School of Law. In addition, she has held a Jean Monnet fellowship at the Global Governance Program at the European University Institute in Florence, and a visiting fellowship at the Justitia Amplificata Centre for Advanced Studies at Goethe Universität in Frankfurt.

Constitutionalism has become a byword for legitimate government, but is it fated to lose its relevance as constitutional states relinquish power to international institutions? This book evaluates the extent to which constitutionalism, as an empirical idea and normative ideal, can be adapted to institutions beyond the state by surveying the sophisticated legal and political system of the European Union. Having originated in a series of agreements between states, the
EU has acquired important constitutional features like judicial review, protections for individual rights, and a hierarchy of norms. Nonetheless, it confounds traditional models of constitutional rule to the extent that its claim to authority rests on the promise of economic prosperity and
technocratic competence rather than on the democratic will of citizens.
Critically appraising the European Union and its legal system, this book proposes the idea of 'functional constitutionalism' to describe this distinctive configuration of public power. Although the EU is the most advanced instance of functional constitutionalism to date, understanding this pragmatic mode of constitutional authority is essential for assessing contemporary international economic governance.