David is a clinical psychologist who has worked for over 30 years in clinical and forensic settings with offenders and victims of offences. His experience includes high, medium and low secure NHS settings, as well as community forensic services. Whilst a lecturer at Liverpool University he developed and taught the SAGE special needs forensic interviewing system. He was also a founding co-director of the Forensic Behavioural Studies programme at Liverpool University. Subsequently he was a course director of the Child Forensic Studies programme at Leeds University and also the Forensic Issues programme at the (now) University of Cumbria. He has worked as an expert witness in criminal and civil proceedings for over 25 years, often in complex, highly contested or high profile cases. David now works for an independent forensic practice evaluating and also undertaking investigative interviews of children and adults with a learning disability.