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Email

oc291@cam.ac.uk

Interests

Orfeas' research combines doctrinal and theoretical approaches, tackling fundamental issues of public international law and legal reasoning from first principles. He holds degrees from Cambridge (PhD), NYU (LLM), Athens (LLM) and Thessaloniki (LLB).

Fellowships, grants, and awards

Research Fellowship, Gonville and Caius College, University of Cambridge • Max Weber Fellowship, European University Institute • Cambridge University Yorke Prize • Sinclair Fund Scholarship, Gonville and Caius College • AG Leventis Foundation PhD Scholarship • WM Tapp Studentship in Law, Gonville and Caius College • Cambridge AHRC Doctoral Partnership Studentship • Cambridge Trust, Honorary George & Marie Vergottis Scholar (waived) • Academy of Athens, International Law Scholarship (waived) • NYU Jerome Lipper Prize for International Law (LLM prize) • NYU International Law and Human Rights Fellowship • Fulbright Scholarship • AG Leventis Foundation Scholarship for LLM studies • Harry D Triantafillou Scholarship • Honorary State Scholarship for 2009-10 (IKY)

Peer recognition

- Recipient of the Yorke Prize

- Member of the EJIL Advisory Board

- Member of the appointing panel for the 2023 and the 2024 Max Planck-Cambridge Prize for mid-career international law scholars

- Research mentioned twice in the official bibliography of the International Court of Justice: vol 62, p 103; vol 59, p 69.

 

Research centres and interest groups

Selected publications

 

Books

A Theory of International Organizations in Public International Law (Cambridge University Press, 2025)

Articles

''Statehood and International Organization: Rethinking their Conceptual Relationship with Reference to Customary International Law' ' (2025) 36(3) European Journal of International Law

Citation:
(2025) 36(3) European Journal of International Law
Published: Forthcoming

'‘Preliminary Issues Posed by the Doctrine of Forum Prorogatum and the Case of Djibouti v. France’' (2013) 15 International Community Law Review 483

Citation:
(2013) 15 International Community Law Review 483
Published: Dec 2013

''Customary International Law: Interpretation from Beginning to End’ ' (2020) 31(1) European Journal of International Law 235

Citation:
(2020) 31(1) European Journal of International Law 235

''“The Consciousness of a Duty Done?”: British Attitudes towards Self-determination and the Case of the Sudan’' (2019) 89(1) British Yearbook of International Law 1

Co-Author/s:
Sarah Nouwen
Citation:
(2019) 89(1) British Yearbook of International Law 1

Book Chapters

"‘The Problem of Applicable Law in the Contractual Relations between International Organizations and Private Parties’" in Jan Klabbers (ed(s)), International Organizations Engaging the World (Oxford University Press), forthcoming

Published Forthcoming

"'ISDA’s Private Governance Scheme in the Credit Derivatives Market’" in Benedict Kingsbury (ed(s)), Global Hybrid and Private Governance (Cambridge University Press), forthcoming

Published Forthcoming

"‘The Problem of Applying Customary International Law to International Organizations’ (in Greek)" in Vasileios Pergantis (ed(s)), The EU’s Responsibility in the International Legal Order (Sakkoulas Publications, 1970)

Book Reviews

‘The Concept of an International Organization in International Law, by Lorenzo Gasbarri’ (2023) 20(2) International Organizations Law Review 233

‘The Self-Seing Soul and Comparative International Law: Reading Anthea Roberts’ Is International Law International?’ (2018) 7(1) Cambridge Int’l Law Journal 420

Blog Posts

Reports

"‘Independent legal advice on matters of public international law regarding the appointment of a Supervisory Authority under the MAC Protocol’" (UNIDROIT, Apr 2023)

Body / Institution:
UNIDROIT
Published: Apr 2023