Richard Bennett works as a Clinical Psychologist and Cognitive Behavioural Psychotherapist and runs a private practice, Think Psychology. He also leads a Postgraduate Diploma in Cognitive Behavioural Therapy as part of the Centre for Applied Psychology at The University of Birmingham.

Joseph E. Oliver is a Consultant Clinical Psychologist and director for Contextual Consulting, a consultancy based in London providing ACT training, coaching, and therapy. He is joint director for the University College London Cognitive Behavioural Therapy in Psychosis Post Graduate Diploma, whilst also holding a post within the NHS.