Mark Rennie, Lawyer, Partner & Group Head Family Sussex, Dispute Resolution Family, DMH Stallard
Mark is a family law specialist advising on all areas of matrimonial law and assisting parties in resolving financial disputes arising from the breakdown of their relationship.  He has particular experience in dealing with cases which involve business ownership.

Known as an effective litigator, handling complex disputes in both high and mid net worth cases, Mark seeks to bring a warm and human touch to a process which some people can find difficult. It is his aim for his clients to feel supported throughout.

In addition to matrimonial law, Mark frequently advises on Inheritance Act claims and will disputes.  He has successfully negotiated many pre-nuptial agreements and has a keen interest in wealth preservation.

Mark can also advise and assist if you are not married but need support resolving your financial situation following the breakdown in your co-habitation.

Mark works primarily in our Horsham office but also collaborates closely with colleagues in our other locations.

Work highlights

ULTRA HIGH NET WORTH DIVORCE

GA v EL [2023] EWFC 187 and GA v EL (No. 2) [2023] EWFC 206. The case concerned a single issue; how to divide the proceeds of sale of a business that was started during the marriage but sold after separation. The case considered the importance/relevance of historic business valuations and the courts approach to post separation endeavour.


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Recent articles

Insights

Landmark High Court judgment clarifies approach to international surrogacy cases

Significant new High Court judgment clarifies and advances the law on parental orders in international surrogacy cases.

01/05/2026

Insights

Sham trusts and interveners: DMH Stallard secures landmark win in the Financial Remedy Court

In an era where parents increasingly provide financial support for their children's property purchases, proper documentation is paramount.

24/04/2026

Podcasts

How divorce coaches and family solicitors work together to help clients?

In this episode, we explore the increasingly important role of divorce coaches and how they work alongside divorce solicitors to support clients through the separation process.

19/03/2026

Insights

Resolving financial matters after separation

Both married and unmarried parties are expected to consider non-court dispute resolution before or during court proceedings. This guide talks you through the options.

16/03/2026

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