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Leon Sosnowski

PhD Student


Leon is a qualified solicitor (England & Wales) and a senior legal advisor for a global sovereign fund. Prior to his current role, he gained extensive experience in global risk consulting and as an international lawyer, most recently at Herbert Smith Freehills.

Leon holds an LLB (Hons), LPC, and BSc Politics and International Relations and has completed an MA Legal & Political Theory with Distinction at University College London (UCL).  His research brings together international relations, philosophy of law and political theory to explore questions of political authority as well as its breakdown.


Research Interests

  • Political order, authority and legitimacy
  • Sovereignty and constitutional theory
  • Political order breakdown - including war, revolution, resistance, and terrorism



See Leon Sosnowski's PURE profile



The Normative and the Political: Sovereignty and the international system after Kelsen, Schmitt and Morgenthau.


Professor Ned Lebow

Dr Christoph Kletzer