Jonathan Speck > Mourant > St Helier, Jersey > Lawyer Profile


Work Department

International trusts and private client, insolvency and restructuring, litigation.


A Jersey advocate and Managing Partner of the Jersey office of Mourant Ozannes, Jonathan specialises in commercial litigation involving contentious and non-contentious trust litigation, banking law and practice, and all aspects of financial services regulation. He has written about and lectured widely on litigation and Jersey anti-money laundering legislation. What the directories say: Jonathan Speck is a ‘top-notch litigator who is sensible and results-orientated’ (Chambers Global, 2014); ‘A first-rate lawyer: very good in court, commercially minded and a hugely charismatic figure, well liked by clients’ (Chambers UK, 2014); Jonathan is also ranked in Chambers UK as the only Star Individual for Dispute Resolution in Jersey; Jonathan is named as one of only 10 “Most Highly Regarded Individuals” in the world and as “pre-eminent” in the International Who’s Who of Private Client Lawyers, 2013; Jonathan Speck is ‘in a class of his own’ (Legal 500, 2013); Jersey-based Jonathan Speck wins praise from clients as ‘a good advocate in court – he is articulate, presents cases well and is commercial as well as realistic about alternative approaches’ (Chambers Global, 2013); Jonathan Speck is ‘always calm, measured, knowledgeable and one of the leading names on the island’ ( Chambers UK, 2013); Jonathan Speck is the only offshore lawyer to be listed as one of the world’s Top 5 Leading Lawyers for Contentious Trusts in the Citywealth Leading Lawyers List, 2013.


Called to the English Bar 1990 (currently non-practising); joined Mourant Ozannes 1991; sworn in as a Jersey advocate 1994.


Association of Contentious Trust and Probate Specialists; Society of Trust and Estate Practitioners.

Lawyer Rankings

Jersey > Dispute resolution > Dispute resolution

(Hall of Fame)

Jonathan SpeckMourant

At Mourant, the litigation and dispute resolution group has an impressive depth of practice that includes banking and securities disputes, commercial and employment disputes, as well as public law and insolvency litigation. The team is also noted for contentious matters involving data protection. Taking the lead is Stephen Alexander , ‘a brilliant technical lawyer who is also incredibly user friendly and commercially minded‘, who is adept at multi-jurisdictional trust and commercial litigation, also handling arbitrations and regulatory matters. With ‘a unique ability to guide a client through complex litigation‘, former practice head Bruce Lincoln , who stepped down in November 2021, continues to be instructed by institutional and high-net-worth individual clients in contentious trust issues, also an area of expertise for Jonathan Speck  and Katie Hooper, who became a partner in February 2022. Mathew Cook is the key name for regulatory and white-collar criminal defence work. Counsel Luke Olivier is also recommended.