Our work covers all areas of family law, with particular expertise in the following areas:
Call: 2001
'Jason approaches cases with careful strategy and foresight. His ability to pre-empt issues makes him a trusted choice for complex children work.'
Chambers UK Bar 2026
Jason is an experienced and energetic family law barrister focusing primarily on matrimonial finance and private children work. He is recognised as a leader at the Bar by Legal 500.
Known for his straightforward approach, he combines sensitivity to the difficult issues at play with direct, persuasive oral and written advocacy. He swiftly gains the trust of clients and judges alike.
His finance practice covers the full range of cases and he has developed significant experience in resolving disputes involving hidden assets and complex financial structures. In his private children work, his practice includes appearances in all levels of tribunal up to the Court of Appeal and representation of high-profile individuals. His expertise in both money and children make him a popular choice to provide continuity of representation in the frequent cases where issues arise in both areas.
Jason is well known to be approachable and easy to work with. His expertise and ability to explain complex matters simply to lay audiences have made him popular with broadcast media as well as with clients. He has made numerous appearances to discuss developments in family law, including on Deutsche Welle Radio, Radio New Zealand, Australian Independent Radio News, Feature Story News and others.
Jason also has also advised on family law issues in various drama series, including Mistresses and Silent Witness
To instruct Jason or for more information…
Call: 020 7353 6961
Email: clerks@harcourtchambers.co.uk
Jason’s finance practice includes cohabitation disputes and applications under Schedule 1 of the Children Act 1989, and has involved cases with a considerable asset base and other complicating factors such as hidden assets, family businesses, complex pension arrangements, risk of bankruptcy, and offshore trusts, He also represents clients in international financial disputes such as those relating to maintenance obligations
Jason is regularly instructed in the most involved and demanding of private law disputes which have included issues involving medical treatment, choice of school, and parental alienation as well as all matters relating to child arrangement.
Fact-finding within application by father under inherent jurisdiction. Mother’s allegations of coercive and controlling behaviour not proven.
Jason represented the successful Applicant Mother who applied to relocate with the children to Country Y.
Jason represented the successful Respondent Mother in applications by Father for a child arrangement order and Mother for permission to remove child to Germany. Father’s allegation of alienation not made out and Mother’s application granted.
Jason, instructed by the mother, successfully argued in the High Court that reporting restrictions barring the children from being identified in media reports, should be lifted. Thus, enabling the mother, Ms Daley, to launch a public appeal for help.
Jason deals with all matters relating to the international movement of children, with particular emphasis on applications to relocate children. He also has wide experience of cases of child abduction, forced marriage and transnational abandonment.
Jason represented the successful Applicant father in an application by father seeking return of child (A) to Spain following the death of mother in the UK. Return ordered, despite child’s objections.
Appeal by child against return order, raising issue as to role of a “solicitor-guardian” in 1980 Convention proceedings.
Father’s application for return of children to Sweden.
Jason’s child work covers the most complex and sensitive cases, including serious non-accidental injury, factitious illness and other medical issues involving parental mistreatment and neglect.
Fact-finding in care proceedings. Found that fractures suffered by child were not perpetrated by either parent using force beyond that which it would be reasonable for a parent to use.
Alternative Dispute Resolution
As a qualified Children Arbitrator, Jason is committed to and knowledgeable about all aspects of Alternative Dispute Resolution.
Jason is qualified to accept instructions directly from members of the public under the Direct Access Scheme in appropriate circumstances.
'He is always a pleasure to work with. He displays a calm confidence that clients appreciate.'
'His attention to detail on the case was excellent and he was able to give the client firm but very sensible advice in what was a difficult situation.'
'Jason is charming and has a kind manner with clients. He is able to grasp the most complex of cases quickly and efficiently, and is able to work towards the most favourable outcomes for clients'
Chambers UK Bar 2026
‘Jason offers the service of King's Counsel without the appointment. His advocacy is strong, persuasive and clever, client service is excellent and he always provide his documents with sufficient time to consider without the stress of being in the court room.’
The Legal 500 UK Bar 2026
‘Jason is a seasoned and charismatic barrister with a keen eye for detail and a sensitive approach.'
The Legal 500 UK Bar 2026
'Jason is a formidable barrister, who is charming and straight to the point. He is well liked by counsel and judges alike, and is able to easily understand the most complex of cases.'
Chambers UK Bar 2025
'Charismatic and engaging in court, and a calm and practical presence in conference.'
'A calm and determined advocate.'
Chambers UK Bar 2025
‘Jason is exceptionally bright, very persuasive and compelling on his feet. He is always a safe pair of hands.’
'Jason is exceptionally bright and able to handle the most complex of cases. He is a standout advocate.'
The Legal 500 UK Bar 2025
It’s already been a week since Jason delivered his live webinar with For Media on “How Best to Address Valuation Issues in Financial Remedy Proceedings.”
If you weren’t able to…
Jason Green was instructed by Dawson Cornwell for the Applicant Father in F v M [2025] EWHC 621 (Fam); a fact-finding hearing under inherent jurisdiction.
This was a fact-finding hearing within…
Jason Green, instructed by HMG Law, represented the successful Applicant mother in MC v FG (Relocation) [2024] EWFC 204 (B); an application by mother for permission to relocate with children to…