Mr Graham Coop > Volterra Fietta > London, England > Lawyer Profile

Volterra Fietta

Work Department

Public International Law.


Partner at Volterra Fietta.


Graham is qualified as a barrister and solicitor in New Zealand and as a solicitor with higher rights of audience (Civil) in England and Wales. He advises and represents companies, governments and international organisations on international dispute resolution and public international law, with a particular focus on the energy, natural resources and infrastructure sectors, together with environmental, banking and defence issues. He also advises sovereign clients and energy companies on jurisdictional immunities issues under public international law, including in the context of judicial proceedings before European courts. His work on contentious matters has focused on the Energy Charter Treaty, investment treaties, price revisions under long-term energy sale contracts, and maritime boundary delimitation. He has appeared as counsel, advocate and expert before a wide range of international courts and tribunals, including the International Court of Justice, ICSID, the PCA and the ICC. He is on the UK Attorney General’s list of public international law practitioners.

Before joining Volterra Fietta, Graham served for seven years as General Counsel to the Energy Charter Secretariat, a Brussels-based international organisation responsible for the Energy Charter Treaty. As General Counsel, Graham participated in intergovernmental negotiations on emergency dispute resolution issues and energy transit. He also led the development of the Model Agreements for Cross-Border Pipeline Projects and for Cross-Border Electricity Projects. Graham’s career includes over 15 years in private practice. Prior to taking up his post at the ECT, Graham worked on international dispute resolution issues as a partner in the energy and infrastructure department of the London office of a major international law firm. He has also worked as in-house counsel at a major European gas company and as head of the energy and natural resources department of the Paris office of a major international firm.

Graham is recognised globally as one of the world’s leading experts on international energy law, the Energy Charter Treaty and international investment arbitration. Graham has written and edited a wide range of publications, including “Energy Dispute Resolution: Investment Protection, Transit and the Energy Charter Treaty”.


English (Native), French (bilingual), German and Russian (intermediate).


Graham is a Solicitor of the Supreme Court of England and Wales (1993), a Solicitor Advocate (Higher Rights of Audience (Civil)) of the Supreme Court of England and Wales (2017) and a Barrister and solicitor of the High Court of New Zealand (1989).  Graham also is an Honorary Associate of the Graduate School of Natural Resources Law, Policy & Management of the University of Dundee’s Centre for Energy, Petroleum and Mineral Law and Policy. He is an honorary member of the Investment Treaty Forum of the British Institute of International and Comparative Law. He is a member of the Editorial Committee of the International Energy Law Review and of the Journal of Energy & Natural Resources Law. He is a member of the advisory board of the Association of International Arbitration (Brussels). He is a Legal Expert on the Energy Charter Secretariat’s Legal Advisory Task Force.


University of Paris II – Panthéon-Assas (1993 – 1995), Paris, France – DEA (post-masterate diploma) (with honours) in private international law and international commerce

University of Auckland (1986 – 1991), Auckland, New Zealand – LLB (Hons); Annual Prize in Commercial Law (1987)

University of Auckland (1983 – 1985), Auckland, New Zealand – BSc; Senior Prize in Computer Science (1985), University Junior Scholarship (1981 and 1982)

First Prize, Australian and New Zealand Mathematics Competitions (1981)


Classical music (piano, cello, singing); member of Brussels Philharmonic Orchestra and choir of St Andrew’s Church of Scotland; snowboarding, skiing, horse-riding, cycling, swimming, gym; member of Aspria Royal La Rasante sports and leisure club; literature (especially history, economics, religion); travel; and, last but not least… being the husband and father of a lovely family!

Lawyer Rankings

Latin America: International firms > International arbitration

London-based international arbitration boutique Volterra Fietta has extensive experience advising on public international law and investment treaty matters involving Latin American and Caribbean states. The firm regularly handles state-to-state proceedings, including cases before the International Court of Justice (ICJ), and also takes on international arbitration for states and investors before ad hoc tribunals, the PCA, ICSID, the SCC and other institutions. The practice is also involved in a steady stream of commercial arbitrations, and in addition, has recently worked with states to reformulate model bilateral investment treaties (BITs). ‘Experienced and confident’ founding partner Robert Volterra is the main point of contact, with Latin America arbitration veteran Graham Coop another key name. Peter Flint , who joined the firm in 202o as a consultant, was raised to the partnership in 2021 and brings extensive international arbitration, cross-border litigation and alternative dispute resolution (ADR) to the team. Counsel Alvaro Nistal left the firm to join Arnold & Porter in June 2021.

London > Dispute resolution > International arbitration

Housing lawyers who are ‘absolutely at the highest level‘, the investment treaty arbitration practice at specialist public international law (PIL) firm, Volterra Fietta represents both states and foreign investors. The firm is also increasingly involved in commercial arbitrations. Robert Volterra is an investment treaty arbitration expert; Graham Coop focuses on energy, natural resources and infrastructure-related matters; and Peter Flint is ‘detail oriented‘. Counsel Gunjan Sharma is a PIL and international dispute resolution specialist, while associate Angela Ha is ‘very thorough‘.

London > Dispute resolution > Public international law

Without doubt the leading firm in public international law‘, Volterra Fietta‘s large PIL practice acts for private entities, states and international organisations across the full range of PIL work, including International Court of Justice (ICJ) cases, maritime boundary claims, and investment treaty and International Centre for Settlement of Investment disputes (ICSID) arbitrations. The firm also fields specialists in state immunity cases, the laws of war and international humanitarian law, along with international human rights, state responsibility, and WTO and international trade law. The ‘best public international lawyer around‘, Robert Volterra assists with a wide range of PIL issues; Graham Coop is particularly focused on the energy, natural resources and infrastructure sectors; and the experience of recently elevated partner Peter Flint includes acting for governments and commercial parties in international disputes. Recently promoted counsel Gunjan Sharma, and associates Angela Ha and Jehad Mustafa, all have extensive PIL experience.