Hussein Haeri


Hussein is a partner in the international arbitration and public international law teams and co-head of the Middle East group.

Hussein jointly leads the firm’s international arbitration team and leads the firm’s public international law team. He is a solicitor-advocate of the senior courts of England and Wales, and has experience of working on international legal and dispute resolution matters in London, Paris, New York and South Africa for over 15 years. He is also a Solicitor-Advocate of the Eastern Caribbean Supreme Court (BVI).

Hussein co-heads the firm’s Middle East group and leads many cases involving the Middle East and North Africa region.

Hussein is recognised in Who’s Who Legal which notes that he is ‘an amazing lawyer and thorough professional’ and ‘one of the most brilliant international public law specialists out there.’ He comes ‘highly recommended’ by Chambers Global, commended as ‘an outstanding lawyer, combining a great attention to detail with a view of the big picture’ with ‘excellent case management and strategic skills’. He is also recognised by Legal 500 for International Arbitration and Public International Law, which states that ‘the practical and solutions driven Haeri is outstanding’ and that ‘He combines huge intellectual powers with great client handling and gives straight-to-the-point advice’.

He has worked as counsel and advocate on arbitrations under all the major rules, including ICSID, UNCITRAL, LCIA, ICC, SCC and SIAC Rules, as well as in ad hoc arbitrations. His clients include governments, multinational corporations and international organisations.

He has served as counsel in state-state proceedings before the International Court of Justice and in national courts, including the courts of England and Wales, on public international law issues.

Hussein’s public international law practice includes advising governments and international organisations on international investment law, constitutional and human rights matters, sovereign immunity, energy and natural resources, international humanitarian law, sanctions, the law of the sea and treaty and legislation drafting.

Hussein is a Senior Fellow on International Investment Law at SOAS, University of London. He is a Member of the Faculty at the University of Rome, Roma Tre University, Certificate Course in International Commercial and Investment Arbitration. He has also taught international arbitration and public international law to graduate students at the London School of Economics, Kings College London and University College London in the UK and at Sciences Po and the University of Versailles in France. He has published extensively in the fields of international law and international arbitration.

In addition to his work as counsel, he sits as an arbitrator.


Hussein Haeri is an amazing lawyer recognised for his excellent understanding of arbitration proceedings and public international law.

Who's Who Legal, Future Leaders Arbitration 2020

Hussein Haeri combines deep technical knowledge of investment treaty arbitration with clarity of strategic direction and impressive project management skills. He demonstrates excellent customer focus and sound judgement.

Thomas Le Feuvre, Head of International Agreements - Government of Jersey

I would definitely recommend Withers Law Firm for international arbitration. Mr Hussein Haeri and his team acted as legal counsel for Gemmo in a high value international arbitration which we won, and I can say they were all highly experienced, extremely helpful and always available to discuss strategies, with an eye to meeting the client’s needs and requests.

Mr Alessandro Chiappin, General Counsel - Gemmo SpA

A first rate lawyer who blends strategic thinking with excellent client management skills on top of his cases, very knowledgeable about investor-state jurisprudence… an exceptional lawyer.

Global Arbitration Review

Hussein’s strategic advice and know-how on how to navigate international arbitrations has proved to be exceptionally valuable over the two years we have been working together.

Senior oil and gas professional

A rising star in the fields of investment arbitration and public international law.

Global Arbitration Review 100

A name that is destined to join the pantheon of stars in the international arbitration arena.

Legal Business Disputes Yearbook

Hussein Haeri is ‘an amazing lawyer and thorough professional’ according to respondents, one of whom notes, ‘He is one of the most brilliant international public law specialists out there.’

Who's Who Legal, 2019

The practical and solutions-driven Haeri is outstanding; he has both a strong understanding of the law and an excellent client-handling manner. He combines huge intellectual powers with great client handling and gives straight-to-the-point advice.

Legal 500, 2019

Track record





Scholz GmbH v Kingdom of Morocco Counsel of the Claimant in an ICSID arbitration related to a metals recycling business.

Asian investor v Sub-Saharan African State Counsel of the Claimant in an UNCITRAL arbitration related to a free trade zone.

Advising a State on proceedings before the International Court of Justice concerning a human rights treaty.

England and Wales, 2008

Eastern Caribbean Supreme Court (BVI), 2020

Sovereign Wealth Funds: Transnational Regulation and Dispute Resolution’, Withers and British Institute of International and Comparative Law, Co-author, 2021

‘And You Are?: Dual Nationals in Investment Treaty Arbitration’, BCDR International Arbitration Review, Wolters Kluwer, 2016.

‘The Non-Disputing State Party in Investment Arbitration: An Interested Player on the Third Man Out’ in Practicing Virtue: Inside International Arbitration (Editors: D. Caron, S. Schill, A. Smutny and E. Triantafilou), Oxford University Press, Oxford - 2015

ICC Task Force on Trusts and Arbitration

London Court of International Arbitration (LCIA)

LCIA Arab Users’ Council

Arbitrator Panellist at Kuala Lumpur Regional Centre for Arbitration

‘Renewing the Relationship between Treaty and Custom in International Investment Law’, BIICL Investment Treaty Forum (ITF) Conference - March 2019

‘Investment Arbitration: Five Controversies’, SOAS, University of London - October 2017

‘Investment Arbitration in Ukraine and the CIS’, Law Society of England and Wales - March 2017



  • English
  • French





Regularly works with...