Ulf Linderfalk is Professor of International Law at Lund University. He is a 'specialized generalist'. His research has examined issues such as normative conflict, legal hierarchy, legal interpretation, intertemporal law, legal principles, legal concepts, good faith, abuse of rights, proportionality, and the international legal system as such. Eric De Brabandere is Professor of International Dispute Settlement and Director of the Grotius Centre for International Legal Studies at Leiden University's Law School. He also practises in international law and (investment) arbitration (as partner with DMDB Law in Brussels).