He conducts research in Public International Law and European Law and has held visiting fellowships at New York University, Heidelberg, and Cambridge. His recent publications include 'The Regulative Force of the Right to Internal Self-determination' 76 Heidelberg Journal of International Law (2016), and 'Collectively Protecting Constitutionalism and Democratic Governance in Africa: A Tale of High Hopes and Low Expectations?' 4 Cambridge International Law Journal (2015) (together with Kalkidan Obse).