Before joining Leiden University in 2018, Daniel worked at the International Court of Justice as an Associate Legal Officer for President Abdulqawi A. Yusuf. He was awarded a PhD in Law from the University of Cambridge, where he was a member of Gonville & Caius College and a recipient of the WM Tapp Studentship. He is a graduate of The Graduate Institute, Geneva, and the London School of Economics, where he was awarded the Lauterpacht/Higgins Prize for Public International Law.
Daniel has published widely on matters of general international law, including treaty interpretation, the procedure of international courts and tribunals, and international trade law.
His monograph, Comparative Reasoning in International Courts and Tribunals, examines the use of domestic law in the interpretation of international law, and was published by Cambridge University Press in 2019. Daniel is co-editor of Interpretation in International Law, published by Oxford University Press in 2015. He continues to conduct research on treaty interpretation in his capacity as Rapporteur for the ILA Study Group on the Content and Evolution of the Rules of Interpretation.
Daniel has been a visiting researcher/scholar at Harvard Law School, the Max Planck Institute for Comparative Public Law and International Law, and Sciences Po, Paris. He taught both undergraduate and postgraduate students in the Faculty of Law and Department of Politics and International Studies at the University of Cambridge.
At Leiden, Daniel teaches principally on the Master of Law in Advanced Studies in International Dispute Settlement and Arbitration.
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