Seth Cumming is a barrister and partner at Joseph Hage Aaronson & Bremen LLP (JHA) in London. He has acted as counsel for over fifteen years in international commercial litigation and private wealth disputes.
Chambers High Net Worth 2026 (Private Wealth Disputes) describes him as “incredibly impressive” and “a deep thinker, a clear communicator”, with “outstanding levels of commitment, sophistication and commercial awareness.”
He appears as an advocate in the English courts and before arbitral tribunals under the ICSID, UNCITRAL, ICC and LCIA rules, including in investment treaty claims against sovereign states. He has acted in disputes involving Chile, Cyprus, Greece, Italy, Luxembourg, Monaco and Russia, as well as Jersey, Guernsey, India, Singapore and the United States.
Most of his work is cross-border, and much of it turns on how English law interacts with civil law systems. His commercial cases include contract, shareholder and joint venture disputes between parties in different jurisdictions, often with proceedings running in parallel abroad, and claims to trace and recover assets across borders. His private wealth cases include disputes where forced heirship rules collide with English or offshore trusts, and conflicts between succession regimes under the EU Succession Regulation. In both areas, he acts on the enforcement of foreign judgments and arbitral awards in England, and of English judgments abroad.
Seth speaks Spanish and is comfortable discussing cases directly with clients and co-counsel in Spain and Latin America.
Barrister, England and Wales, 2010
English, Spanish (good working knowledge)
University College London – LLM (Merit)
London School of Economics and Political Science – MSc (Merit), Commonwealth Scholar
City University Law School – Bar Professional Training Course (Outstanding)
BPP University – LLB (First Class Honours)
Rhodes University, South Africa – BSc (Double First)
