Jack is the epitome of a family barrister. He has a warm approach to clients and has a laser focus on the most compelling arguments.

Chambers UK 2025, Family: Matrimonial Finance

Jack is Head of the Divorce and Financial Remedy team. He has a busy court-based practice specialising exclusively in complex financial remedy litigation.

Jack is consistently ranked in both Chambers UK and the Legal 500 as a leading junior, and is particularly recognised for his excellent preparation and client-care skills, the depth, breadth and clarity of his advice, and his eloquent and robust advocacy.

Jack is one of only eight barristers on the Western Circuit to be ranked by Chambers UK in Band 2 for matrimonial finance work.

He regularly gives lectures, produces podcasts, and writes articles on topical legal issues and supports local higher education institutions.

Jack is a member of the Pupillage Committee.

Divorce and Financial Remedy

Jack’s instructions are often in high-value cases with complex factual or legal issues involving companies, partnerships, farms, trusts, pensions, pre/post nuptial agreements, foreign and inherited wealth. His cases also involve disputes about matrimonial / non-matrimonial property, allegations of serious personal, financial, and litigation misconduct, as well as intervenor issues. He is also instructed in cases with more modest means where his compassionate and solution-focussed approach is valued by clients.

An empathetic and pragmatic advocate, Jack is known for his detailed preparation and his ability swiftly to narrow down the key issues.

Jack will strive to achieve settlement wherever possible but will take a robust approach if litigation is inevitable. He is described by peers as a “fearless advocate” and “the counsel you want on your side” with a “laser focus on the most compelling arguments”.

Recent cases include:

  • Securing favourable indications at Private FDR leading to settlement in the context of a ‘notice to show cause’ application where there was a substantial pre-marital property portfolio worth more than £1m.
  • Representing a disabled client at trial and successfully opposing an application for an immediate order for sale of her home based on her alleged cohabitation. Jack also secured a substantial costs order against the applicant.
  • Successfully making a Daniels v Walker application at short-notice in a case where assets are approximately £4m.
  • Successfully acting for the respondent to an appeal at short-notice and negotiating a very favourable resolution where the issue was the trial judge’s exclusion of a significant pre-marital defined benefit pension scheme.
  • Representing a party at very short notice at a 4-day trial having had no previous involvement where one of the major issues was non-compliance with orders for expert business valuations. Multiple property and business assets totalled £1.4m. Jack successfully negotiated a favourable settlement, avoided adverse inferences being drawn, and secured a substantial reduction in the costs order sought by the other side.
  • Success at a preliminary issue trial representing a party in their support of an intervenor application which sought the return of monies loaned to the parties to buy the family home.
  • Successfully opposing a ‘notice to show cause’ application on the basis that the agreement struck between the parties was not unfair in relation to pensions.
  • Successfully negotiating a settlement in a multi-million-pound case involving a family business, serious conduct allegations, allegations of significant dissipation of matrimonial assets, and ‘add-back’ arguments.
  • Capital and pension issues in a more modest case arising from one spouse having a significantly reduced life expectancy.
  • Successfully negotiating a settlement where conduct issues were pursued against Jack’s client arising from findings of serious domestic abuse and coercive and controlling behaviour in parallel Children Act proceedings.

Children Private Law

Jack has significant experience in representing parents in private law disputes about their children, ranging from disputes about child arrangements to relocation and to schooling, to name but a few, and happily accepts instructions where Children Act disputes run in conjunction with financial remedy proceedings.

Jack draws on the experience and expertise for which he is known to attempt amicably to resolve often highly acrimonious and emotional disputes wherever possible, but will take a robust approach to litigation if this is required.

Directory Quotes

Jack is a highly experienced advocate who exudes understanding and compassion for his clients.

The Legal 500 2025, Family: Matrimonial Finance

Jack is the epitome of a family barrister. He has a warm approach to clients and has a laser focus on the most compelling arguments.

Chambers UK 2025, Family: Matrimonial Finance

Jack is a tenacious advocate with a pragmatic and solution-orientated focus.”

The Legal 500 2024, Family: Divorce and Financial Remedy

Jack is very thorough and he’s passionate about getting the right outcomes for the client. ‘He is a very skilful and thoughtful advocate.’ ‘He is practical and pragmatic.’ ‘One of his greatest attributes is his ability to under promise and then over deliver’.”

Chambers UK 2024, Family: Matrimonial Finance

Jack is highlighted for his strong work across a range of family matters. He practises predominantly in financial remedy work. ‘He is a strong, robust advocate who is able to strike up a good rapport with instructing solicitors and clients alike’. ‘He is able to advise clients on often complex and difficult situations in an empathetic yet robust manner’. ‘He is whip smart and an eloquent advocate’.”

Chambers UK 2023, Family: Matrimonial Finance

An eloquent advocate who exudes warmth and charm.”

The Legal 500 2023, Divorce & Financial Remedy

Jack is a strong, robust advocate who is able to strike up a good rapport with instructing solicitors and clients alike. ‘He is able to advise clients on often complex and difficult situations in an empathetic yet robust manner’. ‘He is whip smart and an eloquent advocate’.”

Chambers UK 2023, Family: Matrimonial Finance

Jack is extremely bright, knowledgeable and enthusiastic with a strong attention to detail. He has an excellent manner with clients, immediately making them feel reassured, supported and confident that they are in the best of hands. ‘His advocacy skills are first-class and he is always extremely well prepared. He is attentive to solicitors and does an exceptional job throughout.’ “

Chambers UK 2022, Family/Matrimonial

He is extremely well-prepared and approachable. He provides realistic advice, and is always willing to go the extra mile for a client.”

The Legal 500 2022, Family and children law

Jack is extremely bright, knowledgeable and enthusiastic with a strong attention to detail. He has an excellent manner with clients, immediately making them feel reassured, supported and confident that they are in the best of hands. ‘His advocacy skills are first-class and he is always extremely well prepared. He is attentive to solicitors and does an exceptional job throughout.”

Chambers UK 2022, Family/Matrimonial

Jack is extremely well-prepared and approachable. He provides realistic advice, and is always willing to go the extra mile for a client.”

The Legal 500 2022, Family and Children Law

Jack is enthusiastic and has an excellent client manner. He narrows down the key issues swiftly and works very hard to reach an amicable settlement while never forgetting the clients’ objectives. He is tenacious in his approach, leaving clients reassured and fully supported.”

Chambers UK 2021, Family/Matrimonial

Good on his feet and great with clients.”

The Legal 500 2021, Family and Children Law

Seminars & Events

  • Qualifications & awards:

    • LLB Hons (Queen Mary, University of London): First Class
    • BPTC (The City of Law School): Outstanding.
  • Professional memberships:

    • The Honourable Society of Lincoln’s Inn
    • The Family Law Bar Association
    • Bar Pro Bono Unit
    • The Western Circuit
  • Additional information:

    Jack is originally from Devon and moved to London to undertake his legal education and training. After reading law at Queen Mary, University of London Jack joined the Honourable Society of Lincoln’s Inn and undertook the BPTC at The City Law School. Jack returned to the West Country to undertake his pupillage at St John’s Chambers in October 2013 under the supervision of Nick Miller, Dianne Martin, and Zoe Saunders. Upon successful completion of his pupillage Jack accepted an offer of Tenancy in October 2014.

  • Jack Harris is regulated by the Bar Standards Board (BSB) and holds a current practising certificate. If you are not satisfied with the service provided, please read here.