Assistant Professor, Grotius Centre for International Legal Studies, Leiden University. 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. 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. He is co-editor of Interpretation in International Law, which was published by Oxford University Press in 2015, and co-rapporteur for the ILA Study Group on the Content and Evolution of the Rules of Interpretation .