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Jack Sproson (Member) Guernica 37

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Called: 2021

Jack is a member of the Bar of England and Wales and joined Chambers upon successful completion of pupillage in July 2022. He has a mixed domestic and international practice and accepts instructions in most of Chambers’ practice areas. 

Domestically, Jack regularly brings claims under the Human Rights Act 1998 and Equality Act 2010, often in the context of individuals within the prison estate. He is also experienced in judicial review proceedings, actions against the police, criminal appeals work, and claims under the Data Protection Act 2018.


Internationally, Jack accepts instructions principally in Public/Private International law, International Human Rights Law, International Humanitarian Law, International Criminal Law, and issues relating to Transitional Justice. In addition to contemporaneously advising on legal issues arising in live armed conflicts, he has dealt with matters before several international courts and tribunals, including, inter alia, the European Court of Human Rights, the UN Working Group on Arbitrary Detention, the International Criminal Court, the Kosovo Specialist Chambers, and the UN Mechanism for International Criminal Tribunals. Jack has supported several individuals in respect of their appeals against INTERPOL Red Notices and is an experienced practitioner in the area of business and human rights. 


Current International Instructions

Kosovo Specialist Chambers 

Presently assisting with the representation of a number of persons and bodies being investigated by the KSC. 



Instructed by a group of Syrian (I)NGOs as project lead in respect of international lobbying and legal advisory efforts to support the continuation of cross border aid in Syria in the absence of a UN Security Council Mandate. 

Principal drafter of an ‘INTERPOL Guide for Syrian Human Rights Defenders’, which, funded by The Day After with generous support of the Government of Sweden, provides practical tools and strategies to ensure the safety of Syrian Human Rights Defenders subject to abusive Red Notices following Syria’s reintegration to the INTERPOL systems. 

Part of the legal team responsible for advocating for the opening of an investigation into the Syrian conflict at the International Criminal Court. Responsible in particular for leading on complex and innovative jurisdictional submissions so as to allow the Court to do so. 

Part of the legal team responsible for submissions requesting that the Metropolitan Police open an investigation into Asma Al-Assad on the basis of terrorism charges. 



Instructed on behalf of a Serbian client before the European Court of Human Rights in respect of the State’s allegedly unlawful failure to enforce an Arbitration Award issued against public bodies. 



Part of a legal team involved in efforts to bring a Saudi-led coalition before the International Criminal Court in respect of their alleged commission of international crimes in Yemen; responsible for leading on the development and application of innovative jurisdictional submissions in order to so. 


Democratic Republic of Congo 

Part of legal team instructed to advise on complex transnational prosecutorial efforts in respect of international crimes committed in the DRC’s civil war. 



Part of a legal team bringing a complaint before the Metropolitan Police in respect of money laundering offences said to be linked to Venezuelan corruption and issues relevant to State capture of (financial-) resources. 


The Gambia 

Presently engaged as part of a legal team responsible for advising the Gambian Government on issues relevant to accountability and transitional justice in the country.

Notable Recent Domestic Instructions  
  • Successfully defended an individual (previously of good character) on all counts of 2x counts of Actual Bodily Harm and 1x Use of an Offensive Weapon. 

  • Acting pro bono, successfully represented an individual in an appeal against a University’s decision to terminate their studies on the grounds of issues linked to their Autistic Spectrum Disorder.

  • Successfully represented an individual unlawfully detained for nearly a year in respect of immigration proceedings, settling the claim for a substantial award. 

  • Successfully negotiated a settlement against a major international service and goods provider on behalf of an international corporate client. 

Previous experience

Prior to commencing pupillage with G37, 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 Global Rights Compliance LLP. 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 Ottawa based NGO, CANADEM and the UN Development Programme, respectively.

From November 2019 – May 2020, Jack spent 6-months interning with the Chambers division of the UN International Residual Mechanism for Criminal Tribunals.

In August 2019, Jack graduated magna cum laude from his Master of Laws (LLM) in Public International Law from Leiden University, where his thesis focussed on accountability options for corporate human rights abuses. He was also a finalist in the Telders International Law Moot Court Competition, where, having pled in the International Court of Justice, he was awarded Best Oral Applicant Argument and, alongside his teammates, the Max Huber Award for Highest Overall Score and the Carnegie Award for Best Respondent Memorial.

In 2018, Jack obtained his Bachelor of Laws (LLB) First Class (Hons), from Durham University, receiving the highest mark in his cohort for international criminal law.

Jack was awarded the Goldie Award from The Honourable Society of Gray’s Inn, and the Excellence and Career Commitment Scholarship from BPP University for the BTC.​


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 

Data Protection 

International Human Rights Law

International Criminal Law

International Humanitarian Law

Public International Law 

Private International Law

Business and Human Rights

Government Advisory Work

Transitional Justice and Rule of Law Development 

Atrocity Crime Prevention

International Commercial Law, Arbitration & Mediation

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