Mark O'Callaghan BA (Oxon), LLM.

Membership Status: Barrister - Full Member

General Information

Called to the Bar in 2001, Mark is a highly experienced Family and Civil Law Barrister. He travels throughout England and Wales to represent clients in the Family Courts and County Courts.

With a practical, proactive and personal approach, Mark regularly appears in financial remedies proceedings involving property, TOLATA/cohabitation claims, prenuptial agreements, separation agreements, periodical payments and pensions including ring-fencing issues.

Mark helps members of the public facing difficult disputes over child arrangements, contact, specific issues and prohibited steps, and parental responsibility. Mark is experienced in cases between parents with local authority involvement, as well as allegations of domestic abuse and cases with a foreign element.

As a Barrister of almost 20 years’ experience, Mark is also regularly instructed in Personal Injury cases including Road Traffic Accidents, Employers’ Liability, Occupiers’ Liability and accidents abroad. Praised for quick turnaround of papers, Mark works closely with solicitors on cases from low-value claims through to multi track work.

Mark has a Masters degree in Medical and Healthcare Law and has attended a short course on Coronial Law & Inquests at Sheffield University.

Legal expertise:

- Property claims, property sale and division of equity
- TOLATA claims for unmarried couples
- Maintenance including applications to vary or enforce
- Pensions including ring-fencing issues
- Representation at First Appointments, FDR and Final Hearings
- Applications to vary or enforce

- Live With orders
- Contact issues
- Parental responsibility
- Allegations of domestic abuse
- Specific issue and prohibited steps including abduction

- Road Traffic Accidents
- Public Liability
- Employers’ Liability
- Holiday claims including accidents abroad
- Low-value whiplash claims through to multi-track matters

- Fatal accidents and inquests

Direct access and solicitor instructed

Qualified under the Direct Access scheme, Mark accepts direct instructions from members of the public, particularly in Family Law matters. Talking in plain English, Mark helps individuals who are dealing with financial separations and child arrangements to understand the court process, providing support during a stressful time.

In Personal Injury cases, solicitors that Mark has worked with for many years value his swift communication, regular case updates and partnership approach to getting the best outcome for every client.

Professional qualifications & associations

- BA (Hons) Jurisprudence, Oriel College, Oxford
- LLM University of Liverpool

- Family Law Bar Association
- Resolution
- Personal Injuries Bar Association

Wider interests

Outside court, Mark enjoys open water swimming and running. He has completed several marathons, including the London Marathon in under three hours. As a classical music fan Mark regularly attend concerts at the Liverpool Philharmonic Hall and Bridgewater Hall, Manchester.


Mark O'Callaghan recently assisted me in a two-day variation hearing [in respect of a financial remedies order]. It wasn’t the easiest of matters but his calm and collected nature helped to keep my anxiety in check. Many thanks and would definitely recommend.

AB Direct access client

It has been a pleasure to work with you and further briefs on the way in future. The client was similarly very pleased with your calm approach and the outcome was added positive feedback.

Alexander Adeyemo Alfred James Solicitors

Mark was able to quickly and efficiently understand my [financial remedies] case, whilst managing my personal expectations where others had lacked composure to do so. What sets Mark apart from other Barristers is his personal tone in a very confusing and stressful arena. He was able to pitch my case with absolute balance and clarity ... I had complete trust Mark was able to convey my opening statements to the judge with persuasion and influence. A quality operator."

M Woodcock Direct Access Client

I needed a barrister at very short notice. Mark O'Callaghan stepped in to help. He was excellent - thorough, efficient, proactive in his advice, and extremely helpful all round. It made an enormous difference to me. Thank you so much.

Sarah Direct Access Client

“Firstly I need to say how appreciative I am for your help on this case. Thank you for the way you handled the Defendant's impromptu submissions and for persuading the Court to allow you to come back to me to send the further documents. I am very happy with everything. Thank you.

Lauretta Matthias Matt Rowland Solicitors

"I just wanted to drop you a line and thank you so much for your very kind assistance and accepting instructions at such short notice for the hearing. You have been so approachable, helpful, professional and obtained the outcome we wanted. Thank you so much. I will not hesitate to use your services again.”

Martin Armitage Minster Law


Inquest Touching upon the Death of Edward Bilbey (2020). Representing the mother and brother of a seventeen year old who died shortly following a boxing match. Prevention of Future Deaths Reports made to England Boxing and Secretary of State for Sport.
Mark O'Callaghan

phone01823 247 247

Qualified in 2001