John Greenfield

John's specialisms span the full range of major litigation and advocacy work, including asset tracing, multi-jurisdictional disputes, and commercial and trust litigation. He been involved in many of the most significant 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 before the Privy Council.

John was admitted as a solicitor in England and Wales in 1975. After five years' practising in England (undertaking both criminal defence and civil litigation), he moved to Guernsey in 1980 to work for an international merchant bank.

In 1986, he joined another leading Guernsey law firm and, in the same year, was called to the Guernsey Bar and became a notary public. He headed the firm's Litigation Department from 1989 and served as Managing Partner from 1998 to 2017. Following this tenure, he remained at the firm as a Consultant until June 2025, when he joined Mourant.

John is a founding member of FraudNet, a body of the world’s leading fraud lawyers established by the International Chamber of Commerce.