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Career & Experience

Jonathan leads the firm’s commercial disputes team and advises on complex, high-value commercial disputes, with particular expertise in pensions litigation and matters involving international elements. Jonathan’s focus is on delivering clear strategic guidance and effective resolution, whether through litigation, arbitration, or early intervention.

Clients turn to Jonathan when the issues are intricate, the stakes are high, and a strategic approach is essential. He regularly acts for corporates, trustees, and professional services firms on technically challenging disputes, often involving overlapping regulatory, fiduciary, and contractual issues. Many of Jonathan’s cases involve cross-border components, and he is well-versed in managing jurisdictional questions and coordinating with overseas counsel.

Jonathan is particularly known for his work in pensions disputes and for supporting international clients or referrers needing English law advice. Jonathan brings a calm, pragmatic perspective and aims to provide advice that is not only legally robust but also commercially grounded and easy to act on.

Outside of work, Jonathan enjoys cycling and gardening.

Accolades

  • Chambers UK Guide 2024 Eminent Practitioner - Litigation
  • Association of Pension Lawyers member
  • Accredited Mediator

Career & Experience

Jonathan leads the firm’s commercial disputes team and advises on complex, high-value commercial disputes, with particular expertise in pensions litigation and matters involving international elements. Jonathan’s focus is on delivering clear strategic guidance and effective resolution, whether through litigation, arbitration, or early intervention.

Clients turn to Jonathan when the issues are intricate, the stakes are high, and a strategic approach is essential. He regularly acts for corporates, trustees, and professional services firms on technically challenging disputes, often involving overlapping regulatory, fiduciary, and contractual issues. Many of Jonathan’s cases involve cross-border components, and he is well-versed in managing jurisdictional questions and coordinating with overseas counsel.

Jonathan is particularly known for his work in pensions disputes and for supporting international clients or referrers needing English law advice. Jonathan brings a calm, pragmatic perspective and aims to provide advice that is not only legally robust but also commercially grounded and easy to act on.

Outside of work, Jonathan enjoys cycling and gardening.

Accolades

  • Chambers UK Guide 2024 Eminent Practitioner - Litigation
  • Association of Pension Lawyers member
  • Accredited Mediator

Testimonials

Don't just take our word for it

I like Jonathan’s approach. He is not just a trusted adviser but a strategic partner as well.

Chambers & Partners, 2027

He presents strategies well and gave us confidence in persevering with the case.

Chambers & Partners, 2027

Jonathan and his associate quickly grasped our problem and were very effective in the process. They quickly stopped an escalation to litigation.

Chambers & Partners, 2027

Jonathan Grigg – Very personable, easy to speak to, and able to explain in layman’s terms.

Legal 500, 2027

Jonathan Grigg – Strategically astute and able to think on his feet. Firm and measured yet polite and charming with the opposition. He does not get drawn into irrelevant side arguments and points and is laser-focused on achieving the strategic objective.

Legal 500, 2027

Jonathan Gregg is excellent at client communication and providing valuable, relevant advice.

Legal 500, 2027

Jonathan Grigg has a great eye for strategy and is an excellent decision-maker

Legal 500, 2027

Jonathan Grigg has excellent client care skills and strategic awareness.

Legal 500, 2026

“Jonathan Grigg is a good litigator.”

Chambers and Partners UK, 2025

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