Jonathan Speck

'One of the big names in trust litigation, and deservedly so'

— Chambers UK, 2017

Jonathan Speck

Senior Partner



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.

I am the firm's Senior Partner, a leadership role that entails being an ambassador for the Mourant Ozannes group, our clients and people. I've been a partner since 1996 and served as Managing Partner of the Jersey Office and President of the Law Society of Jersey between 2014 and 2017. 


  • 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

‘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."

Jonathan is also praised by Chambers and Partners UK, 2021:

"He is galactic figure in the trust space and a very skilled advocate."

"He is an incredibly skilled lawyer and an excellent advocate."

"He is superb and incredibly well respected."

"A great leader", "hugely respected", Legal 500 UK 2020.

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

Jonathan is named in the prestigious Legal Week Private Client Global Elite directory, 2019.

Jonathan Speck is described as 'tremendously experienced and hugely respected' by Legal 500 UK, 2019.

Jonathan Speck is a ‘charming, urbane and exceptionally clever stand-out star’, Legal 500 UK, 2019

'Clients describe him as "well regarded" in the market, adding that he is "an articulate advocate who responds well on his feet."' Chambers UK, 2019

'Jonathan Speck  is "certainly a star performer in Jersey," says a source. He is universally admired for his expertise in trust cases, with one commentator saying: "He is widely known around the world as probably the finest trust litigator in the Channel Islands. It is a joy to see him operate." Another interviewee adds: "He is the leader of the Jersey Bar. My impression is that his experience of big trial litigation is unrivalled."' Chambers UK, 2019. 

For Dispute Resolution, Jonathan is described as 'one of big names in trust litigation, and deservedly so. He is a very strategic, very sharp and very good litigator. A person you'd want to have on your side', Chambers UK, 2017.

Jonathan is also described as an 'immaculate advocate who has the intellect to grasp difficult issues and complex high-value cases' with an opposing counsel stating that 'he is very clever and very able,' Chambers UK 2017, Trusts.

'Jonathan Speck ‘combines immaculate charm with magisterial courtroom presence’,' Legal 500 UK, 2016. Jonathan is also listed as a Leading Individual for Dispute Resolution.

'Jonathan Speck is lauded as one of the finest litigators in Jersey. A source says: 'Whenever anyone asks me who is the best, I tell them it is Jonathan. He is brilliant at trust litigation and very good at non-contentious advice',' Chambers UK, 2016, Dispute Resolution.

'Jonathan Speck 'is very knowledgeable and definitely someone I would go to if I needed guidance'. He is renowned for his work on contentious trust matters,' Chambers UK, 2016, Trusts.

'Jonathan Speck 'has incredible eloquence and is very good on his feet', says one peer, while another commentator states: 'He's the go-to lawyer in Jersey – calm, polished, smooth, but also just a good lawyer',' Chambers UK, 2015. Jonathan is ranked as the only Star Individual for Dispute Resolution in Jersey.

Who's Who Legal, 2015, recommends Jonathan in Private Client.

Jonathan is described as a 'very good advocate with a meticulous approach' and is ranked as a Leading Individual and Recommended in Dispute Resolution, Legal 500 UK, 2015.

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