John is a highly experienced criminal practitioner, who acts for both prosecution and defence, dealing with cases of the utmost gravity and sensitivity, many of which have attracted widespread publicity. The focus of John's practice has been homicide, serious sexual offences, drugs conspiracies and fraud. He is also a member at 9 Park Place Chambers, Cardiff.

John has a particular specialism in modern day slavery cases and led the prosecution team in the trial of Operation Imperial, which arose from the largest police investigation into modern day slavery in Wales. He is well accustomed to leading a team of lawyers in the presentation of complex cases to a jury.

John has frequently represented professional or high profile individuals accused of serious crime. These include professional sportsmen and police officers.

John's expertise has led to him conducting training in POCA and financial crime issues for lawyers and police officers in the Caribbean. John is an accredited pupil supervisor and has been a category 4 prosecutor for over 20 years.