The Theory, Practice, and Interpretation of Customary International Law

Panos Merkouris is Professor of International Law at the University of Groningen. He holds a Chair on Interpretation & Dispute Settlement in International Law. He is the Principal Investigator of the TRICI-Law project. Professor Merkouris has written extensively on interpretation, most recently co-authoring Treaties in Motion (2020) with Professor Malgosia Fitzmaurice.

Jörg Kammerhofer is Senior Research Fellow at the University of Freiburg, Germany, and Privatdozent for international law and legal theory at the Vienna University of Economics. He is a generalist international law scholar, specialising in legal theory, and has published widely, including, recently, International Investment Law and Legal Theory: Expropriation and the Fragmentation of Sources (2021).

Noora Arajärvi is Postdoctoral Fellow with the ERC funded project 'Cultural Expertise in Europe: What is it useful for?', and Associate at the Hertie School. She is the author of The Changing Nature of Customary International Law (2014) and several journal articles and book chapters on customary international law and other key questions of international law.