Jonathan Ketcheson > Twenty Essex > London, England > Lawyer Profile

Twenty Essex

Work Department

  • Banking and financial services
  • Commercial law
  • International arbitration
  • Private international law
  • Public international law
  • Shipping and international trade


Jonathan practises across all Chambers’ areas of expertise, including international arbitration, public and private international law, shipping, banking, and commercial law generally. He has acted for states and investors in investment treaty arbitrations, under both the ICSID Convention and the UNCITRAL rules. Jonathan has also acted for companies in international commercial arbitrations under the ICC, LCIA and LMAA rules. He is also appointed to the Attorney General’s Public International Law C Panel of Counsel.

He initially qualified as a solicitor in Australia, practising in commercial litigation, before working as an associate to Justice Crennan of the High Court of Australia. Jonathan was also a senior associate at Hogan Lovells in London, specialising in investment treaty arbitration, public international law and international arbitration.

Prior to joining the bar, Jonathan was a research assistant to Professor James Crawford (now Judge Crawford of the International Court of Justice) and completed a doctorate on international dispute settlement at the University of Cambridge under Professor Crawford’s supervision. Jonathan was also an assistant to the Bahrain Independent Commission of Inquiry.

Lawyer Rankings

London Bar > International arbitration: counsel

(Leading Juniors)Ranked: Tier 3

Jonathan KetchesonTwenty Essex ‘Jonathan is very smart and a first class advocate, both on his feet and on paper – excellent in the field of investor-state disputes.’