John Greenfield > Carey Olsen (Guernsey) LLP > St Peter Port, Guernsey > Lawyer Profile

Carey Olsen (Guernsey) LLP
John Greenfield photo

Work Department

Dispute Resolution and Litigation


John is a partner and advocate in the litigation and dispute resolution group in Guernsey.  John undertakes the complete range of major litigation and advocacy work including asset tracing, multi-jurisdictional disputes and commercial and trust litigation.

John has been counsel in many of the major litigation cases before the Royal Court of Guernsey and the Guernsey Court of Appeal and is one of the few Guernsey advocates to have appeared as counsel in the Privy Council.  He has been lead counsel in ground-breaking trust litigation cases in the past 12 months including the much awaited Tchenguiz family trust litigation in which the Privy Council judgment was published in April and a further important commercial dispute in which a judgment is currently awaited from the Court of Appeal.

John had previously obtained a unique Order of the Guernsey Court putting the Tchenguiz Trust assets into receivership. John is currently acting as an expert legal witness in a major case before The Hague Court of Appeal. He was founder member of the Guernsey Royal Court working party which completely reviewed the Island’s civil procedure in 2008.


Solicitor and partner, England 1975; in-house counsel and trust manager for an international merchant bank in Guernsey 1980; qualified as advocate with the firm and became partner 1986.


English, written French.


UK Fraud Advisory Panel; founder member and only Guernsey member of Fraudnet (set up by the International Chamber of Commerce for its members) and currently a member of its Advisory Board.

Member of the Association of Contentious Trust and Probate Specialists; John was the first elected Head of the Guernsey Bar in November 2008 and was re-elected to the role in 2010.


University of Hull, Université de Caen Basse-Normandie (1992 Certificat d’Etudes Juridiques Francaise et Normandes); Notary Public 1986.


Active sportsman – especially cricket and tennis. Otherwise leisure mostly occupied by family commitments and travel.

Lawyer Rankings

Guernsey > Dispute resolution

(Hall of Fame)

John GreenfieldCarey Olsen

Carey Olsen has an established reputation for acting on local and international disputes, representing parties in the corporate, commercial, financial services, trusts and intellectual property fields. With the election of David Jones to the partnership in 2019, the team boasts an exceptionally strong insolvency offering for high-profile domestic and multi-jurisdictional mandates. Clients highly praise John Greenfield (‘invaluable‘), Elaine Gray (‘indefatigable and indestructible‘), Karen Le Cras (‘very clever and approachable‘) and Tim Corfield (‘extremely strategic‘; ‘incredibly thorough‘). The client base includes a healthy roster of banks and financial services providers, public bodies, trust companies and UK law firms, with further mandates including fraud, asset tracing, employment, data protection, professional negligence and contentious regulatory matters.