Jonathan has a versatile practice across a range of Chambers’ areas of expertise, with a focus on public international law, international arbitration and commercial law. He is a member of the Attorney General’s Panel of C Counsel for Public International Law.
Since joining the Bar, Jonathan has:
Jonathan is a Visiting Lecturer in public international law at King’s College London and a Senior Legal Adviser with the Public International Law & Policy Group in Washington DC.
Jonathan represents clients in a variety of commercial disputes, ranging from the sale and supply of goods and services, to shareholder disputes, product liability, group actions, environmental harm and personal injury. His work often focuses on cases with an international dimension and he frequently acts as counsel in cases raising questions of jurisdiction and / or applicable law. This includes jurisdiction challenges. Since joining the Bar, Jonathan has worked on cases with Cypriot, Cayman, German, Greek, Falkland Islands, Iraqi, Korean, Kuwaiti and Mauritian governing law.
Featured Commercial Law cases
Jonathan acts as counsel and adviser for commercial parties, private individuals and States in commercial and investment arbitrations under the LCIA, ICC, ICSID, UNCITRAL and AAA rules. He also acts in arbitration related court proceedings before the English courts, including enforcement matters.
Featured International Arbitration cases
“Jonathan is an excellent technical lawyer, precise and thoughtful. His extremely easy manner is appreciated by clients and lawyers alike.” – Legal 500, 2023
Jonathan is a leading expert in international criminal law. He acts for States, individuals, victims and NGOs in international criminal law cases and investigations concerning genocide, war crimes and crimes against humanity. He also acts as counsel or legal adviser in cases concerning the structure and establishment of transitional justice accountability mechanisms, and in claims concerning arbitrary detention, enforced disappearances or torture, in particular cases before UN Special Procedures. He is experienced acting in cases before the International Criminal Court and ad hoc tribunals.
Featured International Criminal Law cases
Jonathan is a specialist in international human rights law and UN engagement. He has extensive experience in cases before UN Special Procedures (such as the Working Group on Arbitrary Detention, Special Rapporteurs, UN Reprisals mechanisms), as well as working on Human Rights Council matters, including the Universal Periodic Review. He is further experienced in cases of business and human rights.
Featured International Human Rights cases
“Jonathan’s advice is always accurate and takes into account the bigger picture of an issue.” – Legal 500, 2023
“Though light-hearted in manner, Jonathan is deeply serious about his work. A wise head on rather young shoulders.”– Legal 500, 2022
“Commended by Silks for the way he sparks off ideas.” Legal 500, 2021
Featured International Trade & European Law cases
Jonathan is a leading expert on EU withdrawal and international trade. Between 2017-2021, Jonathan worked as an Assistant Legal Adviser at the Foreign, Commonwealth & Development Office on legal issues relating to the UK’s withdrawal from the EU. As part of this work, Jonathan acted for the UK or advised Government departments on all manner of issues ranging from UK-third country treaty negotiations to advising on fisheries and the post-EU jurisdictional regime.
Further examples of current and recent work include:
“Jonathan has an in-depth knowledge of international law. He is very creative in terms of constructing legal arguments. He is well liked by clients and teams alike. He is a persuasive and charming advocate.” – Legal 500, 2023
“When it comes to complex inter-state disputes, he has an eye for strategy and is always thinking two steps ahead.” – Legal 500, 2022
Jonathan has a substantial public international law practice spanning all areas of public international law (law of the sea; the law of treaties; immunities; State responsibility; international criminal law; international environmental law; international organizations etc.). He is particularly experienced in high-stakes international negotiations and often works with clients on an ongoing and long-term basis to find solutions to complex legal and policy issues. Jonathan accepts instructions as a mediator.
Jonathan has more than six years of experience working for the Foreign, Commonwealth & Development Office as an Assistant Legal Adviser on issues relating to the law of treaties, EU withdrawal, overseas territories and law of the sea.
For further details of Jonathan’s international human rights and international trade and EU law experience, please see the tabs above.
Featured Public International Law cases
International Court of Justice:
International Criminal Court:
Kosovo Specialist Chambers:
European Court of Human Rights:
International law in the English courts:
International negotiations, mediations and significant advisory work:
UK Parliamentary Inquiries:
UN Human Rights and / or Special Procedures:
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