Jonathan Arr Partner

Jonathan specialises in international contentious trust, probate and succession disputes, high-value family disputes and commercial litigation.

The clients for whom he acts range from multinational corporations, international private wealth managers and trust companies through to a diverse spectrum of high-net-worth individuals both from the UK and from around the world, including South America, Europe and the Middle East.

Jonathan is an experienced litigator in both the UK courts and foreign courts, including Singapore, Bermuda, the Cayman Islands, BVI, the Channel Islands, the Isle of Man and Mauritius. He acts on the full range of matters affecting private clients including breach of trust claims, fraud claims, blessing applications, challenges to wills, Inheritance Act claims, art and cultural property disputes and applications to deal with mistaken advice or flawed decisions by way of rectification or revocation. He has particular expertise resolving difficult and long-running disputes between beneficiaries of both English and offshore family trusts owning large multinational businesses.

As well as acting in court proceedings, he has also advised clients in numerous successful large-scale settlement negotiations and mediations, particularly in the context of family disputes. Jonathan is a member of the Association of Contentious Trusts and Probate Specialists.

Jonathan also has substantial expertise in high-value employment law and commercial disputes, acting for financial institutions, in particular, in the High Court and employment tribunals.

What people are saying


"He is very strong - he is one of the brightest partners in the City. He is also very pragmatic and a solutions-oriented lawyer."

Chambers HNW 2020

"He is very strong - he is one of the brightest partners in the City. He is also very pragmatic and a solutions-oriented lawyer. He loves the law and will pick out a strong technical argument, he's very versatile."

Chambers HNW 2019

"He "excels in cases that have a stronger emotional aspect. He is good at arguing his client's case but also reaching a resolution.""

Chambers HNW 2019

"The 'organised, very determined and assured' Jonathan Arr 'has established himself as a major presence in the sphere of international trust litigation."

The UK Legal 500 2018

"'He is highly intellectual, sensible and very commercial,' says one source, and another notes that 'he has a sharp mind and a great feel for litigation'."

Chambers UK 2018

"Jonathan has 'a razor-sharp mind and a great feel for litigation. He is tenacious and hardworking and handles his cases brilliantly'"

The UK Legal 500 2017

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