The theory of boundary organizations was developed to address an important group of institutions in American society neglected by scholarship in science studies and political science. The long-term stability of scientific and political institutions in the United States has enabled a new class of institutions to grow and thrive as mediators between the two. As originally developed, this structural feature of these new institutions-that is, their location on the boundary between science and politics-dominated theoretical frameworks for explaining their behavior Applying the theory of boundary organizations to international society requires a refocusing of some of the theory's central features, however In this article, I introduce a new framework-hybrid management-to explain the activities ofboundary organizations in the more complex, contingent, and contested settings of global politics. I develop the framework of hybrid management using the specific example of the U.N. Framework Convention on Climate Change's Subsidiary Body for Scientific and Technological Advice.