Helmut Philipp Aust is a Professor of Law at the Freie Universität Berlin, Department of Law. He has previously held teaching and research positions at Ludwig-Maximilians-Universität München and at Humboldt-Universität zu Berlin. He was also a Visiting Fellow at the Lauterpacht Centre for International Law, University of Cambridge and a Visiting Scholar at Melbourne Law School. His research areas lie in the fields of public international law, EU law and German as well as comparative constitutional law. He is the author of Complicity and the Law of State Responsibility (CUP 2011) and Das Recht der globalen Stadt (Mohr Siebeck 2017) as well as co-editor of The Interpretation of International Law by Domestic Courts (OUP 2016).