Contributor(s): Dr Jan Kleinheisterkamp, Professor Martti Koskenniemi | The Investor-State Dispute Settlement (ISDS) provisions in the Transatlantic Trade and Investment Partnership (TTIP) have recently become a major political stumbling stone. What can be learned from the resistance in terms of legal compatibility with EU law and domestic law – and of political acceptability? Jan Kleinheisterkamp is Associate Professor at LSE Law and teaches International Arbitration, Contracts, and Investment Treaty Law. Much of his recent research has focused on the interaction between investment treaty law and EU law and influenced the work of the European Parliament on this subject. Martti Koskenniemi is Professor of International Law at the University of Helsinki and Centennial Professor at LSE. Shawn Donnan (@sdonnan) is World Trade Editor at the Financial Times. LSE Law (@lselaw) is an integral part of the School's mission, plays a major role in policy debates & in the education of lawyers and law teachers from around the world. LSE Works is a series of public lectures, that will showcase some of the latest research by LSE's academic departments and research centres. In each session, LSE academics will present key research findings, demonstrating where appropriate the implications of their studies for public policy. A list of all the LSE Works lectures can be viewed at LSE Works.