Mark has a broad practice in commercial law, international arbitration and investment arbitration. He has acted for corporations and State-owned entities in a wide variety of disputes at all levels of the English courts and in arbitrations under all major institutional rules.

Since 2019, Mark has acted for the Guaidó Board of the Central Bank of Venezuela in extensive and high-profile litigation arising out of Venezuela’s constitutional and political crisis and the battle for control of Venezuela’s gold reserves at the Bank of England, which has led to numerous hearings in the Commercial Court, Court of Appeal and Supreme Court (Maduro Board v Guaidó Board).

Mark also recently acted for the successful appellant in an appeal to the Privy Council (from the Court of Appeal of the Cayman Islands) which concerned the arbitrability of disputes between shareholders in the context of just and equitable winding up proceedings (FamilyMart v Ting Chuan).

Mark is ranked by The Legal 500 (International Arbitration: Tier 3) and Chambers and Partners (Commercial Dispute Resolution: Band 5), where he is described as “one of the best juniors around” who “comes up with fantastic ideas which nobody else thinks of”. He is also ranked as a Future Leader in Who’s Who Legal: Arbitration 2024.

Before joining Chambers, Mark practised as a barrister in New Zealand at a leading commercial set. He also worked as a law clerk for two leading international arbitrators, where he gained exposure to many international commercial arbitrations and investment treaty arbitrations. He is a graduate of the University of Oxford and the University of Auckland.