José Manuel Álvarez-Zarate is Professor at Externado University of Colombia and Director of the Law and Economics Department where he runs the IEL program. He holds a degree in Administrative Law and a Ph.D. He was a visiting scholar at American University Washington College of Law in 2016–2017; a visiting professor at Fundación Getulio Vargas, Río de Janeiro, Brazil, October–November in 2015; and a visiting research fellow at the British Institute of International and Comparative Law, London, England in May–June, 2009. He has been teaching and practicing in the fields of IEL, economic administrative regulation, and dispute settlement for more than twenty-eight years and has been widely published. His legal experience includes consultancy for private and public entities in trade negotiations and international business, as well as acting before administrative courts, arbitration panels, the Andean Tribunal, and international arbitration.

Filip Balcerzak, LL.M., Ph.D., attorney at law is admitted to the bar in two jurisdictions: Poland (adwokat) and Spain (abogado). He specializes in commercial dispute resolution at both national and international levels. He has successfully led cases for a variety of clients from different jurisdictions, utilizing his fluency in English and Spanish.

His experience includes advising and representing parties in international arbitrations (e.g., in ad hoc arbitrations with their seat in New York and London). He is an arbitrator at the Court of Arbitration at the Polish Chamber of Commerce and the Lewiatan Court of Arbitration.

He effectively combines professional and academic activities. He completed his LL.M. studies at the University of Ottawa, specializing in International Trade and Foreign Investment Law. Subsequently, he was granted a Ph.D. in public international law by Adam Mickiewicz University in Poznań (Ph.D. dissertation title: “Investor state arbitration and human rights,” written in English). Currently, he is an associate professor (research) at the Faculty of Law and Administration of the Adam Mickiewicz University in Poznan. He has authored numerous publications on international investment arbitration.

Patrick Dumberry is a full professor at the University of Ottawa (Civil Law Section). He holds a Ph.D. from the Graduate Institute for International Studies (Geneva). He practised international investment arbitration with law firms in Geneva (Lalive), Montreal (Norton Rose), as well as with Canada’s Ministry of Foreign Affairs (Trade Law Bureau). He is the author of more than ninety publications in the fields of international investment law and international law, including the following books: The Fair and Equitable Treatment Standard: A Guide to NAFTA Case Law on Article 1105 (Wolters Kluwer, 2013); The Formation and Identification of Rules of Customary International Law in International Investment Law (Cambridge University Press 2016); A Guide to State Succession in International Investment Law (Elgar 2018); Fair and Equitable Treatment: Its Interaction with the Minimum Standard and Its Customary Status (Brill 2018); A Guide to General Principles of Law in International Investment Law (Oxford University Press 2020); Rebellions and Civil Wars: State Responsibility for the Conduct of Insurgents (Cambridge University Press 2021).

Saïda El Boudouhi is Professor of Public Law at the University of Paris 8 Vincennes Saint-Denis, and her specialties range from public international law, international economic law (investment and WTO law), the application of international law in domestic systems, and the law of international organizations. She earned her Ph.D. from the University of Paris 1 Panthéon-Sorbonne in 2009, completed her postdoctoral studies at the European University Institute, University of Florence, Italy, and was an invited researcher at the University of Arizona College of Law from 2019 to 2020.

Emmanuel Giakoumakis is an Associate Lawyer at Steptoe & Johnson LLP, where he focuses his practice on public international law, with an emphasis on international investment law and State-to-State adjudication. He is also a D.Phil. candidate at the University of Oxford, Faculty of Law. He was formerly an Associate Legal Officer at the International Court of Justice (ICJ), where he advised the President of the Court on his judicial and presidential duties while also working on a wide range of international law disputes. Prior to that, he worked in different law firms as a legal advisor to governments and private corporations on various questions of public international law, including the law of treaties and State responsibility, investment arbitration, and international human rights law. He has held seminars at the Hague Academy of International Law (2019) and the Institut International de Droits de l’Homme (International Institute of Human Rights) (2018).

Horacio A Grigera Naón is Distinguished Practitioner-in-Residence and Director of the Center on International Commercial Arbitration at the Washington College of Law. He is a former secretary general of the International Court of Arbitration of the International Chamber of Commerce and a practitioner in the field for over thirty years.

Oliver Hailes is Assistant Professor of Law at the London School of Economics and Political Science, where he lectures public international law, international arbitration, international investment law, and transnational environmental law. He is Assistant General Editor of the ICSID Reports. Before arriving at the LSE, Oliver clerked for an appellate judge, practised commercial litigation, and held several research, teaching, and editorial roles. Recently, he was co-Editor-in-Chief of the Cambridge International Law Journal and a Research Associate with the PluriCourts Centre of Excellence at the University of Oslo.

Łukasz Kułaga is Associate Professor in the Division of International and European Law at the Faculty of Law and Administration of Cardinal Stefan Wyszynski University in Warsaw and a legal expert in the Legal-Treaty Department of the Ministry of Foreign Affairs of the Republic of Poland. Currently Dr. hab. Łukasz Kułaga works on the consequences of aggression against Ukraine for international law. His other fields of expertise are international investment law, the use of force, immunities, the law of treaties, and the law of State responsibility.

Andreas Kulick (Privatdozent, venia legendi et docendi, Tübingen; doctor iuris, Tübingen; LLM, NYU School of Law; First and Second State Exams, Berlin) is a senior research fellow at University of Tübingen, Germany. He is a visiting professor at the Albert Ludwigs University Freiburg in the winter semester of 2023–2024. He has been a visiting fellow at the Lauterpacht Centre for International Law, NYU School of Law, and the WZB Berlin. His research focuses on public international law – in particular, on international dispute settlement, and on German and comparative constitutional law and theory. He has experience in advising and representing States in various matters of public international law before international courts and tribunals, including the European Court of Human Rights (ECtHR), International Tribunal for the Law of the Sea (ITLOS), and in ICSID proceedings, as well as before domestic courts. He is a member of the International Law Association (ILA) Study Group on Content and Evolution of the Rules of Interpretation in International Law. He is the author, inter alia, of Global Public Interest in International Investment Law (Cambridge University Press, 2012) and the editor of Reassertion of Control over the Investment Treaty Regime (Cambridge University Press, 2017), and has numerous publications in the area of public international law and beyond.

Sotirios-Ioannis Lekkas is a postdoctoral researcher for the of the TRICI-Law project (ERC grant agreement no 759728) at the Department of Transboundary Legal Studies of the University of Groningen. His research focuses on the content and evolution of rules of interpretation in international law. Prior to this position, Sotirios worked as a judicial fellow at the ICJ and as a tutor in public international law at the University of Oxford, Faculty of Law. He holds a D Phil in Law from the University of Oxford. He has studied law in Athens and London (University College London), where he was awarded the George Schwarzenberger Prize in International Law by the University of London. He is also a member of the Bar in Athens, Greece (non-practicing).

Madhav Mallya is Associate Professor at the Jindal Global Law School. He has also taught at National Law University, Delhi, India; Lloyd Law College and the School of Law, Uttar Pradesh, India; and Bennett University, Uttar Pradesh, India. He completed his BBA LLB from Symbiosis Law Schools, Pune, Maharashtra, India, in 2010 and LLM from McGill University, Montreal, Canada, in 2011. He was also a doctoral student at McGill University from 2014 to 2016 and an accomplished scholarship student at the Centre for International Governance Innovation, Waterloo, Canada, in 2016. His areas of research and teaching interest include international investment law and public international law.

Diego Mejía-Lemos, LLM, Ph.D., serves as a scholar and practitioner of international law and dispute resolution. He holds, among others, graduate degrees from New York University and the National University of Singapore (NUS). He has participated in the representation of States in proceedings before international courts, including while working as a juriste international at Freshfields Bruckhaus Deringer’s Paris Office. Furthermore, he has provided support to arbitral tribunals conducting proceedings under the Permanent Court of Arbitration’s auspices. Recently, he has held a postdoctoral fellowship at NUS and has been appointed as a distinguished research associate professor within the Xi’an Jiaotong University’s ‘Young Talent’ program.

Panos Merkouris is Professor of International Law at the University of Groningen. His five-year project on The Rules of Interpretation of Customary International Law was awarded an ERC Starting Grant (ERC grant agreement no 759728). He specialises in Interpretation, Law of Treaties, Sources of International Law, and Dispute Settlement. Professor Merkouris is currently a member of the editorial boards of the Netherlands Yearbook of International Law (NYIL), the Leiden Journal of International Law (LJIL), and the International Community Law Review (ICLR). He was also the co-rapporteur of the ILA Study Group on the Content and Evolution of Rules of Interpretation in International Law. He is the author of the monograph Treaties in Motion (CUP 2020, coauthored with Professor Fitzmaurice), Article 31(3)(c) of the VCLT, and the Principle of Systemic Integration: Normative Shadows in Plato’s Cave (Martinus Nijhoff 2015). The latter has been cited with approval by a Chamber of the International Criminal Court. He has numerous publications on interpretation, law of treaties, and customary international law.

Nina Mileva is a PhD researcher of the TRICI-Law project (ERC grant agreement no 759728) and a lecturer at the Department of Transboundary Legal Studies of the University of Groningen. Her research focuses on the interpretation of customary international law, and in particular, the development of a theory of interpretation of customary international law. Her research interests relate to the role of international law in the practice of domestic courts, the relationship between international and domestic law, international legal theory, and critical approaches to international law.

Federica I Paddeu is a Derek Bowett Fellow in Law, Queens’ College, and Fellow at the Lauterpacht Centre for International both at the University of Cambridge. Her work has been published in leading international law journals, including the British Yearbook of International Law, the European Journal of International Law, and the American Journal of International Law. A monograph based on her PhD dissertation “Justification and Excuse in International Law: Concept and Theory of General Defences,” was published by CUP in 2018. She is a member of Blackstone Chambers Academic Research Panel and admitted to practice in Venezuela, as a member of the Caracas (Distrito Federal) Bar.

Konrad Turnbull is a PhD researcher within the Department of Transboundary Legal Studies and Faculty of Economics & Business at the University of Groningen. Whilst his core research focuses on international courts’ approaches in adjudicating cases of structural discrimination and the public’s perception of the efficacy of these institutions, his research interests also include international investment law and the international leasing of public powers. He holds an LLB & LLM in International Human Rights from the University of Groningen, an LLM in International Comparative Law from The George Washington University Law School, and a BS in Digital Filmmaking from Shepherd University.

Anna Ventouratou is a DPhil candidate and tutor in Public International Law. Her thesis explores the availability of the defenses codified in Part I, Chapter V of the Articles on the Responsibility of States for Internationally Wrongful Acts in international adjudication. She focuses on disputes before the ICJ, the WTO Dispute Settlement System, and Investment Arbitration. Her doctoral studies are supervised by Professor Catherine Redgwell, Chichele Professor of Public International Law at All Souls College, and Professor Miles Jackson, Associate Professor of Law at Jesus College. Anna has studied law at the University of Athens (LLB; LLM in Public International Law (dist)) and the University of Oxford (MJur (dist); MPhil). Her studies in Oxford have been supported by the University of Athens “A Gazis” Trust, the Peter Carter Graduate Scholarship in Law (Oxford Faculty of Law and Wadham College), and the Academy of Athens.

Maciej Żenkiewicz is Assistant Professor of Public International Law at Nicolaus Copernicus Univeristy (Toruń, Poland) and a visiting professor at Faculty of Social Sciences of the Antonio de Nebrija University. He is an author of various articles and monographs: his latest publication (with contribution as the editor and author) is the book International Investment Law published in Spanish. He is a member of various forums, eg, SIEL or ISDS Academic Forum.