Jack Sproson (Pupil Barrister) Guernica 37

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Called: 2021

Jack is a member of the Bar of England and Wales and joined Chambers as a pupil barrister in July 2021. Jack accepts instructions in most of Chambers’ practice areas at domestic and international levels.

Current work

Since commencing pupillage, Jack has developed experience in a variety of domestic and international fields.

Domestically, Jack has assisted with several actions concerning prisoner rights, as part of which he has developed experience in civil actions and public law challenges to prison policies, in particular those concerning the rights of disabled and religious prisoners.

Jack has also developed experience in both prosecuting and defending extradition cases and acted pro bono for individuals otherwise unable to access legal representation, most recently succeeding in an appeal against a University’s decision to terminate the studies of a student on the grounds of issues linked to their Autistic Spectrum Disorder.

Internationally, Jack has assisted several individuals in efforts to appeal INTERPOL Red Notices issued against them. He is a member of the Defence team for Nasim Haradinaj at the Kosovo Specialist Chambers and has assisted with several submissions to the International Criminal Court and the Metropolitan Police regarding the commission of international crimes in States and conflicts across the globe. 

Jack is involved in a number of projects related to the Syrian conflict, including efforts to achieve accountability for international crimes committed through the use of chemical weapons, and to develop tools for the provision and protection of humanitarian aid and actors, respectively.


Previous experience

Prior to commencing pupillage, Jack spent 3-months interning with Guernica 37’s Academy Internship Programme, as part of which he assisted with a variety of domestic and international work.

From 2020-2021, Jack was involved in the delivery of a number of business and human rights-related projects on behalf of a Dutch CSO and legal consultancy. During this time, he also assisted in the delivery of a capacity building project to Prosecutors in The Gambia, as part of which he was the principal contributor to a best practice manual designed to guide practitioners in bringing charges for crimes against humanity committed under the Jammeh regime.

Alongside this, Jack was part of a team responsible for the delivery of similar projects to both Afghani legal practitioners and members of the Gambian Judiciary on behalf of an Ottawa based NGO, and the UN Development Programme, respectively.


Following the completion of his LLM, Jack spent 6-months interning with the Chambers division of the UN International Residual Mechanism for Criminal Tribunals, as part of which he assisted with research and drafting in cases including Prosecutor v. Jovica Stanšić and Franko Simatović and Prosecutor v. Ratko Mladić.


LLM, Public International Law, Leiden University, Magna Cum Laude 

LLB, Law, Durham University, 1st Class 

BPP University, Bar Professional Training Course, Merit 


The Honourable Society of Gray’s Inn 

Association of Young International Criminal Lawyers

Appointments and Awards

Goldie Award, The Honourable Society of Gray’s Inn 

Excellence Scholarship, BPP University 

Career Commitment Scholarship, BPP University  

Telders International Law Moot Court Competition, Finalist. Recipient of Best Oral Applicant Argument, Max Huber Award for Highest Overall Score, and Carnegie Award for Best Respondent Memorial


Toby Cadman, Carl Buckley, and Jack Sproson, ‘The Bangladesh Crimes Tribunal, Justice Denied’ (book chapter, forthcoming)

Jack Sproson, Carolyn Edgerton, ‘Addressing post-TRRC Cases Presents The Gambia with Hard Questions in its Transitional Justice Journey’ (Guernica 37, 2021)

Global Rights Compliance, ‘Basic Investigative Standards The Gambia’ (Global Rights Compliance, 2020)


Extradition & Mutual Legal Assistance

Prison Law 

Business and Human Rights

Government Advisory Work

Transitional Justice and Rule of Law Development 

Atrocity Crime Prevention

Public International Law

International Criminal Law

International Human Rights Law 

International Commercial Law, Arbitration & Mediation