Dr Marios Tokas is an associate in Cassidy Levy Kent’s Brussels office. He advises clients on international trade and regulatory matters, including EU trade defence matters and WTO matters. Marios also advises on the EU’s Carbon Border Adjustment Mechanism (CBAM), the Foreign Subsidies Regulation (FSR), and free trade agreements.
Marios is a Post-Doctoral Fellow at iCourts, Faculty of Law, University of Copenhagen, where he researches international dispute settlement and teaches EU competition law and international law.
Prior to joining Cassidy Levy Kent, Marios has worked at two large American law firms in Geneva, advising on international trade and investment matters. He also served as Head of Trade Law and Regulatory Compliance at a legal technology start-up in Switzerland and as an independent International Trade Consultant advising governments and international organisations on trade and sustainability policy.
Marios has taught International and European Economic Law as a visiting or adjunct lecturer at the National and Kapodistrian University of Athens, the European Law and Governance School, the Swiss School for International Relations, and the Geneva Graduate Institute. He has also served as Editorial Assistant at the Journal of International Economic Law (Oxford University Press), and as Case Author for the John H. Jackson Moot Court Competition on WTO Law. He regularly publishes articles on international trade, investment and competition issues.
Marios is an EU-qualified lawyer, registered with the Athens Bar Association in Greece.
Professional Affiliations
- Member, Society of International Economic Law (SIEL)
- Member, European Society of International Law (ESIL)
- Member, American Society of International Law (ASIL)
- Member, International Law Association (ILA), Hellenic Branch
Recent Speaking Engagements
- International Standardization Organization Sessions, IAF and ILAC Annual Meetings, November 2025
- Navigating New Horizons: International Economic Law in a Changing World, SIEL Biennial Global Conference, Taipei, July 2025
- Academic Forum 2024, American Society of International Law Mid-Year Meeting, November 2024
- New Technologies in Border Management: Regional Approaches, ESIL Interest Group Pre-Conference Workshop, September 2024
- Research Forum 2024, European Society of International Law, May 2024
- Trade and Sustainability Hub, WTO Ministerial Conference Side Event, February 2024
Publications
Articles
- Interrelation Between Paris Agreement and EU Free Trade Agreements’ Commitments: In Search of a Sustainable Path, 30 European Foreign Affairs Review Special Issue (2025) (with I. Espa)
- New Climate-Aligned, Sustainable Investment Agreements and NDC Implementation: Towards a More Integrated Approach, 3 TDM International Investment Arbitration Vol. 4 (2025)
- The Concept of the Level Playing Field in International Economic Law, 27:3 Journal of International Economic Law (2024)
- Highest Priority Trade Challenges Related to Sustainable Development and Climate Change: Horizontal Climate Change Commitments in EU-Americas FTAs, 50:3 Legal Issues of Economic Integration (2023)
- Playing the Game: The EU’s Proposed Regulation on Foreign Subsidies, 56:5 Journal of World Trade (2022)
- Looking Back into the Future: The Legal Standard of Prohibited Subsidies in the SCM Agreement Through WTO Case Law, Ahead of Reforms, 14:2 Trade, Law and Development (2022)
- Synergies and Approaches to Climate Change in International Investment Agreements, 23:5-6 Journal of World Investment and Trade (2022) (with M. Gehring)
Contributions to Books
- International Sports Competitions and International Economic Law: Regulating Competition Amongst Sports Competitions and Competitors, European Yearbook of International Economic Law 2025 (2026)
- The Regulation of Cloud Technologies and International Investment Law: Territorial and Extra-Territorial Implications, in P. Delimatsis et al. (eds.) New Technologies and International Investment Law (CUP, 2025)
- The Empirics of Arbitrator Challenges in Investor-State Disputes, in C. Giorgetti and C. Titi (eds.) Ethics and ISDS (Nijhoff, 2025) (with C. Rogers et al.)
- State Aid and Subsidy Control in EU’s PTAs: Variable Geometry and Intensity of Commitments, European Yearbook of International Economic Law 2023 (2024)
Education
- PhD in International Law (Minor in International Economics), Geneva Graduate Institute
- Master’s in International Law, Geneva Graduate Institute
- LL.M. in International and European Studies, National and Kapodistrian University of Athens
- LL.B., National and Kapodistrian University of Athens
Languages
- Greek
- English
- French (intermediate)
- Polish (intermediate)
Bar Memberships
- Athens