Warren is a Consultant Clinical Psychologist and is also Visiting Professor at Sunderland University where he is working with the Faculties of Public and Population Health and Mental Health to develop their research programme and training curricula for Public Health and Mental Health professionals.
Warren is the Clinical Lead for the Department of Health Adverse Childhood Experiences. He has a long-standing interest in the relationships between childhood adversity and outcomes later in life. He has done most of his clinical work in specialist early intervention services with service users who are experiencing psychosis.
He has published numerous research articles on the topic of trauma and psychosis and published an edited book in 2006 (now commissioned for a second edition) exploring this theme. Warren led one of the two national IAPT (increasing access to psychological therapies) demonstration sites for Psychosis and was a member of the Children and Young People’s Mental Health Services National Task Force. Warren developed the routine enquiry about adversity in childhood approach as a way of assisting organisations to become more trauma-informed and to support professionals to ask routinely about adversity in their everyday practice.