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Christian is Professor of International Law at the University of Glasgow and a qualified German lawyer (admitted in 2005). He specialises in international dispute settlement, notably inter-State litigation, investment disputes and questions of international sports law.

Over the past decade, Christian has acted in cases before the International Court of Justice, the International Tribunal for the Law of the Sea, the Iran-US Claims Tribunal and in arbitral proceedings. He has experience as counsel, expert witness (on questions of international law), and he also is a member of the German Court of Arbitration for Sport. For notable cases please visit the Expertise tab. In addition to contentious matters, Christian regularly advises governments and investors on a wide range of legal matters, incl. access to international courts, the domestic implication of investment treaties such as TTIP/CETA, the law of the sea, the interpretation of bilateral investment treaties).

As a generalist international lawyer, Christian is able to situate disputes in specialised matters (investment, sports, boundary disputes, immunities, etc.) within the broader context of international law. He is able to work across practice areas to find solutions to increasingly cross-cutting disputes.

Christian has published widely on questions of international law and is recognised as an authority on questions of State responsibility, the law of treaties, international courts and State immunity. He is one of the editors of the leading Commentary on International Court of Justice (2nd edn., Oxford 2012). Other recent publications include The Development of International Law by the International Court of Justice (Oxford 2013); The UN Convention on Jurisdictional Immunities of States (Oxford 2014); and The Genocide Convention (Hart 2014). Christian has held, or holds, visiting appointments at Sciences Po Law School (Paris), at the China-EU School of Law (Beijing), and at the German Sport University (Cologne).

Christian is fluent in German and has a strong working knowledge of French. He has regularly been involved in bilingual (English-French) litigation before international courts.

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