Dr Sotirios Ioannis Lekkas (he/him)
School of Law
Lecturer in International Law
Deputy Director of Sheffield Centre for International and European Law (SCIEL)


+44 114 222 6765
Full contact details
School of Law
EF15b
Bartolome虂 House
Winter Street
Sheffield
S3 7ND
- Profile
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I joined the 小欧视频 of Sheffield in September 2023. My expertise lies in the field of general international law and, specifically, the law of international responsibility and interpretation. I have also conducted research in various specialised fields of international law including the law of the sea, international criminal law, and international investment law. My current project studies the content and evolution of international rules of interpretation across different sources and different subject matters.
Prior to joining Sheffield, I was lecturer in Public International Law at the 小欧视频 of Groningen, the Netherlands and postdoctoral researcher for the ERC-funded project 鈥楾he Rules of Interpretation of Customary International Law鈥 (TRICI-Law). I have also worked as a judicial fellow at the International Court of Justice and taught public international law for the Faculty of Law of the 小欧视频 of Oxford. Other prior engagements include research positions at the British Institute of International and Comparative Law and the 小欧视频 of Athens.
I completed my doctoral dissertation on the intersections between the law of state responsibility and international criminal law at the Faculty of Law of the 小欧视频 of Oxford. I have studied law at the 小欧视频 of Athens (LLB; LLM) and 小欧视频 College London (LLM), where I was awarded the Schwarzenberger Prize in International Law by the Institute of Advanced Legal Studies, 小欧视频 of London. I am also a member of the Bar in Athens, Greece.
- Qualifications
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- DPhil, 小欧视频 of Oxford
- LLM (Dist), 小欧视频 College London
- LLM (Dist), 小欧视频 of Athens
- LLB, 小欧视频 of Athens
- Research interests
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- Law of International Responsibility
- Sources of International Law
- International Criminal Law
- International Law of the Sea
- International Law of Armed Conflict
- International Investment Law
- International Legal History and Theory
- Publications
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Journal articles
Chapters
- Research group
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- Law of International Responsibility
- Sources of International Law
- International Criminal Law
- International Law of the Sea
- International Law of Armed Conflict
- Teaching interests
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- Public International Law
- International Law of the Sea
- International Criminal Law
- International Law and Armed Conflict
- International Investment Law
- International Dispute Settlement
- Teaching activities
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Undergraduate
- Foundations of International Law
- Advanced International Law
Postgraduate
- International Law of the Sea
- Professional activities and memberships
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Deputy Director of the Sheffield Centre for International and European Law