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 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’.

Legal Business Disputes Yearbook says that Hussein is ‘a name that is destined to join the pantheon of stars in the international arbitration arena’.

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 Visiting Lecturer 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.