"You are highly regarded both by colleagues within colleagues 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. 


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