Jonathan Speck

Overview

A Jersey Advocate and Partner of Mourant Ozannes (Jersey) LLP, I specialise in commercial litigation, principally involving contentious and non-contentious trust cases. I’ve written and lectured about these topics around the world.

In 2017, I was elected as an Academician of the International Academy of Estate and Trust Law in recognition of my contribution to the profession.

As the Chair of Mourant Group, a role I assumed on 1 February 2025, I am responsible for Board effectiveness and engagement with shareholders and stakeholders. Previously, I served as the firm's Senior Partner.

I’ve been a Partner since 1996 and previously served as Managing Partner of the Jersey Office and President of the Law Society of Jersey between 2014 and 2017.

Memberships

• Association of Contentious Trust and Probate Specialists
• Society of Trust and Estate Practitioners (STEP).

Professional qualifications

• Advocate, Jersey, 1994
• Called to the English Bar, 1990 (currently non-practising)

What the directories say

 In Legal 500 UK 2026, Jonathan is named in the prestigious Hall of Fame for Dispute Resolution. A source comments: "Jonathan Speck is silky smooth."

In Chambers and Partners High Net Worth 2025, Jonathan is recognised as a Star Individual in Offshore: Trusts and Offshore: Trusts Litigation. He is described as "probably the best advocate at the Jersey Bar." Another source adds: "Jonathan Speck has stage presence like an actor in court. He is a star and he holds the court's ear like very few others can."

Jonathan is listed in the Private Client Global Elite Directory 2025.

In Legal 500 UK 2025, Jonathan is named in the prestigious Hall of Fame for Dispute Resolution.

In Chambers and Partners UK 2024, Jonathan is ranked as a Star Individual in Offshore: Dispute Resolution.

In Legal 500 UK 2024, Jonathan is recognised in the prestigious Hall of Fame for Dispute Resolution. A source comments: "Jonathan Speck is one of the 'big beasts' in the offshore litigation market. He brings huge amounts of experience and gravitas to any case."

In Chambers and Partners High Net Worth 2024, Jonathan is recognised as a Star Individual in Offshore: Trusts in Jersey. He is described as "an excellent lawyer with a great reputation in the market."

In the Chambers and Partners High Net Worth Guide 2023, Jonathan is named as a Star Individual in Offshore: Trusts in Jersey. A source says: "When Jonathan speaks, the court listens."

Jonathan is listed in the Private Client Global Elite Directory 2023.

In Legal 500 UK 2023, Jonathan is a Recommended Lawyer in Dispute Resolution and is described as "the partner all others aspire to emulate."

In Chambers and Partners UK 2023, Jonathan is named as a Star Individual in Trusts and Dispute Resolution and praised for being "a top-level partner within the industry."

"Jonathan Speck – clearly a leader in the field." Legal 500 2022.

Legal 500 UK 2021 states: "Jonathan Speck is, of course, a recognized international star who always delivers the highest quality strategic advice. He is well known as the man to see in Jersey on all legal matters, not just trust litigation."

In Chambers UK 2021, sources identify Jonathan as "a galactic figure in the trust space" who is "an incredibly skilled lawyer."

"A great leader." Legal 500 UK 2020.

Chambers and Partners UK 2020 state Jonathan is: "known around the world for heavyweight offshore litigation."