Hussein Haeri

Partner | London

Hussein is a partner in the litigation and arbitration team, focusing on international arbitration.

He leads the firm’s global arbitration and public international law teams. He advises and represents clients on international arbitrations (commercial and investment treaty), public international law and international dispute resolution matters around the world.

Hussein is ranked in Who’s Who Legal (Arbitration: Future Leaders) which notes that he "impresses market commentators with his ‘combination of strong litigation skills with expert knowledge in public international law’". Legal 500 states that Hussein is ‘a standout operator’, ‘very strong’ and is ‘acknowledged for his leadership qualities’. Legal Business Disputes Yearbook says that Hussein is ‘a name that is destined to join the pantheon of stars in the international arbitration arena’. Global Arbitration Review quotes leading market commentators as saying that Hussein is ‘a first rate lawyer who blends strategic thinking with excellent client management skills’ and that he is ‘very knowledgeable about investor-state jurisprudence’ and ‘an exceptional lawyer’.

Hussein is a Solicitor-Advocate of the Senior Courts of England and Wales and frequently acts as counsel and lead advocate in international arbitrations. He has worked on arbitrations under the major arbitration rules, including for example ICSID, UNCITRAL, LCIA, ICC, SCC and SIAC Rules, as well as ad hoc arbitrations. His clients include governments, as well as multinational corporations and other international investors.

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. He practiced law in New York and Paris before returning to London.

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

Hussein has taught international arbitration and public international law to graduate students at Kings College London and University College London in the UK, at Sciences Po and the University of Versailles in France and at Roma Tre University in Italy. He also regularly provides advice and training on public international law and international arbitration to governments.

Secretary Rachel Stewart


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

Hussein’s ability to connect to our people here and to simply explain different scenarios is amazing.

Marsha Lazareva, Vice Chairman and Managing Director - KGL Investment Company

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

I am very happy with Withers’ services, including with the advice provided, Mr Haeri’s leadership and management of the case and team, a reliable and erudite expert who always considers the real benefit for our company.


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

Legal Business Disputes Yearbook

Hussein Haeri is ‘very strong’; he led the representation of a UK investor in an International Centre for Settlement of Investment Disputes arbitration against the Czech Republic, ‘a standout operator’ and acknowleged for his ‘leadership qualities’.

Legal 500, 2017

Hussein Haeri impresses market commentators with his ‘combination of strong litigation skills with expert knowledge in public international law.

Who's Who Legal, 2017

Track record





A11Y LTD v Czech Republic Counsel of the Claimant in an ICSID-administered UNCITRAL arbitration related to assistive technologies.

Italian energy company ICSID arbitration.

Construction dispute and ad hoc arbitration in North Africa.

England and Wales, 2008

‘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

‘Investment Treaty Arbitration increasingly utilized’, Connecticut Law Tribune, March 2017

‘A Tale of Two Standards: "Fair and Equitable Treatment" and the Minimum Standard in International Law’, 27(1) Arbitration International (2011). This article was awarded the LCIA Gillis Wetter Memorial Prize for 2010-2011

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

‘W(h)ither ICSID jurisdiction?’, Quadrant Chambers Conference, London - April 2016

ASEAN and Investment Treaty Arbitration’, KLRCA / RAIF Conference, Kuala Lumpur, Malaysia - May 2015

‘The BVI and Bilateral Investment Treaties’, Business BVI International Arbitration Conference, British Virgin Islands - May 2015



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