I think it’s fair to say that the settlement is historic, and we have for it the expectations and hopes that you do. 

I want to add to what I know you’ve heard from other colleagues: your opinion and work was illuminating, principled, and necessary.  It made a huge difference for him, for the case throughout discovery and court decisions, and for us as we prepared for trial.  We and our client put our trust in you, and that trust was completely justified.  We are so grateful.  

Hina Shamsi, American Civil Liberties Union, ACLU

"You are highly regarded both by colleagues within within the CPS and those at the bar who recommended you to me." 

Senior Crown Prosecutor

‘It seems to me that the authority and depth of Dr Chisholm's report arguably changes the landscape of the appellant's claim.’ 

Lady Justice Rafferty HS (Uganda), R (on the application of) v Secretary of State for the Home Department [2012] EWCA Civ 94  

Criterion A Psychology Services provide medical legal expert witness reports for criminal, asylum, inquiry and litigation purposes. We specialise in providing expert witness following alleged traumatic events, in particular torture and gross human rights violations. Our detailed and impartial reports can address complex instruction and are Istanbul Protocol compliant. We also specialise in international based claims and can travel to meet people almost anywhere in the world.

We are able to provide experts from several domains, professions and expertise including trafficking and modern slavery experts, neuro-psychiatrists and clinical neuro-psychologists expert in psychological trauma and traumatic brain injury. Please contact us with your enquiries. 

We are proud to collaborate with Forrest Medico-Legal Services who, like us, provide a high standard of medico-legal reports for victims of alleged human rights abuses.

Clients include  Birnberg Peirce & Partners; Turpin & Miller Paragon Law, American Civil Liberties Union,  Redress, The Serious Fraud Office, Treasury Solicitors , American Civil Liberties Union (ACLU) and several others.

Below are some examples that Dr. Brock Chisholm has provided expert witness with. For confidentiality reasons some individual cases cannot be referred to. Click the the link for further information.


Salim Vs Mitchell and Jessen in the ACLU case involving Torture at CIA run black sites

Mark Kennedy and other undercover police officers sued by activists

Asylum, including victims of trafficking


European Court of Human Rights


External Partnerships

We are proud to collaborate with Forrest Medico-Legal Services who, like us, provide a high standard of medico-legal reports for victims of alleged human rights abuses.

We are delighted to announce the formation of a newly created charity, Trauma Treatment International, which exists to provide specialist psychological interventions to victims of organized violence, such as torture, trafficking, slavery and political harassment anywhere in the world. Trauma Treatment International is unique organisation because they both support victims and the orgnisations that care for them. Trauma Treatment International brings together the expertise gained by several decades of work with traumatised populations in a range of geographical and political situations in conflict environments and stable settings.