David G. Kingdon, MD, is a psychiatrist in the UK National Health Service and a Professor at the University of Southampton. He has published widely on cognitive therapy of severe mental illness, among other topics. He has also served as an advisor with the UK Department of Health and as chair of the Council of Europe's Expert Working Group on Psychiatry and Human Rights.

Douglas Turkington, MD, is a liaison psychiatrist at the Royal Victoria Infirmary in Newcastle-upon-Tyne, UK. He is also Professor of Psychosocial Psychiatry in the School of Neurology, Neuroscience and Psychiatry at Newcastle University. A founding fellow of the Academy of Cognitive and Behavioral Therapies, he presents widely on the topic of cognitive-behavioral therapy of schizophrenia, and is actively involved in treatment development and research.