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Department of Land Economy

Environment, Law & Economics


Patrick is a PhD candidate at Cambridge University on a Newton Scholarship, where he is Editor-in-Chief of the Cambridge International Law Journal and was Co-Convenor of the 7th Annual Cambridge International Law Conference (2017–18). He supervises undergraduate students in EU Environmental and Sustainable Development Law, as well as MPhil Environmental Policy and Master of Laws students in International Environmental Law. His PhD research focuses on corporate accountability in international and comparative law for human rights and environmental concerns.

Patrick is a faculty member of the Ateneo de Manila University School of Law (Ateneo Law School) in the Philippines. He is a member of the 'Political Law and International Law', as well as the 'Legal Research and Writing' Departments of Ateneo Law School, teaching a number of courses under these departments. He also served as the Linkages Associate of Ateneo Law School's Graduate Legal Studies Institute and the Programme Coordinator of the Master of Human Rights and Democratisation (MHRD), an EU-funded programme administered by Ateneo Law School in partnership with Sydney University, Universitas Gadjah Mada, Kathmandu Law School, Colombo Law School, and Mahidol University. Patrick also teaches Constitutional Law and International Law at De La Salle University Manila, also in the Philippines.

Patrick previously served at the Office of the President of the Philippines as counsel with the rank of Director IV. He was also a Court Attorney at the Supreme Court of the Philippines and before that, an Associate at Castillo Laman Tan Pantaleon & San Jose Law Firm. While in New York, he worked as Research Assistant and later, as Research Associate to Professor Lori F. Damrosch during her Presidency at the American Society of International Law. He also interned at the Columbia Center on Sustainable Investment and the UNDP Headquarters.

Patrick holds an LLM degree (with Distinction—Harlan Fiske Stone Scholar; Smith Scholar) from Columbia Law School, and is a recipient of the Parker School Certificate of Achievement in International and Comparative Law. He holds a Juris Doctor degree from the Ateneo Law School (Dean’s Bronze Medal for Thesis) and a Bachelor’s degree in Commerce from De La Salle University (cum laude). He was admitted to the Philippine Bar in 2009.


Public International Law, International Human Rights Law, International Environmental Law, Business and Human Rights, Non-State Actors, Sustainable Development, International Investment Law, International Organisations, Constitutional Law, International Dispute Settlement, Moot Court


Key publications: 


  • Patrick Simon Perillo, ‘An Assessment of the Non-Discrimination Principle in the Context of Sexual Orientation and Gender Identity: Shifting the Gears in International Law-Making’ (2016) 1 Ateneo Int’l L Rev 39
  • Patrick Simon Perillo, ‘Highlighting Reproductive Rights in the Quest towards Promoting the Rule of Law in Post-Conflict Societies: Applying the Human Rights Framework in Transitional Justice’ (2016) 1 Ateneo Int’l L Rev 103
  • Patrick Simon Perillo, ‘Transporting the Concept of Creeping Expropriation from de Lege Ferenda to de Lege Lata: Concretizing the Nebulous under International Law’ (2008) 53 Ateneo LJ 434


  • Patrick Simon Perillo, ‘A Study Series on Self-Reliance’ (Chapter 9: Foreign Diplomas) (22 March 2013) (unpublished commissioned report) (on file with United Nations High Commissioner for Refugees & Ateneo Human Rights Center)


  • Patrick Simon Perillo, 'Corporate Accountability in International Law through the Lens of State-Based Transnational Dispute Resolution Mechanisms' (8th Yale Law School Doctoral Scholarship Conference, International Law Working Group, Yale Law School, New Haven, November 2018)


  • Patrick Simon Perillo, 'Drawing the Legal Map for Corporate Accountability under International and Comparative Law: Perspectives from State-Based Mechanisms affecting Business, Human Rights and the Environment' (VI Strathclyde Postgraduate Colloquium on Environmental Law and Governance, University of Strathclyde, Glasgow, May 2018)
  • Patrick Simon Perillo, 'Drawing the Legal Map for Corporate Accountability under International and Comparative Law: Perspectives from Transnational Dispute Resolution Mechanisms affecting Business, Human Rights and the Environment' (2nd Postgraduate Conference in International Law and Human Rights: The Notion of Change in International Law and Human Rights, University of Liverpool, Liverpool, March 2018)
  • Patrick Simon Perillo, 'Human Rights Violations through Environmental Degradation: Exploring the International Accountability of Non-State (Business) Actors under International and Comparative Law' (Human Rights Centre Postgraduate Conference 2017: The Role of Business in the Promotion and Protection of Health and Human Rights, Queen’s University Belfast School of Law, Belfast, June 2017)



Teaching and Supervisions

Research supervision: 

PhD Thesis Title: Drawing the Legal Map for Corporate Accountability in International and Comparative Law: Perspectives from State-Based Mechanisms affecting Business, Human Rights and the Environment

Supervisor: Dr. Markus W. Gehring

Advisor: Professor Jorge E. Viñuales

Start Date: Lent 2017

College: Hughes Hall