Hermine L. Graham is a Consultant Clinical Psychologist and Lecturer at the University of Birmingham, UK. She has expertise in cognitive behavioural therapy, and has led the development and research of service models and treatment approaches for people with severe mental health and co-occurring alcohol and drug problems in Birmingham. This work has been highlighted as a model of "good practice," and is referenced in national policy guidelines for the treatment of "dual diagnosis" (DoH, 2002). She has published widely in academic peer-reviewed journals and is co-author of Cognitive-Behavioural Integrated Treatment (C-BIT) (Wiley, 2004) and co-editor of Substance Misuse in Psychosis (Wiley, 2003).

Alex Copello is Professor of Addiction Research at the School of Psychology at the University of Birmingham, UK, and Consultant Clinical Psychologist with the Birmingham and Solihull NHS Foundation Trust. His career has combined clinical and academic work, and his research has had a major impact on addiction treatment in the UK in recent years. He has published widely in academic journals and books.

Max Birchwood is Professor of Youth Mental Health at the University of Warwick, UK. He pioneered the concept and practice of early intervention in psychosis, and opened the UK's first Early Intervention in Psychosis service in 1994. He has published widely in the field of psychosis, and is the author of many books.

Emma Griffith is a Lecturer and Clinical Tutor at the University of Bath, UK, and a Clinical Psychologist in Avon and Wiltshire Partnership Mental Health NHS Trust. She is accredited as a Cognitive Behavioural Psychotherapist by the British Association for Behavioural & Cognitive Psychotherapies (BABCP).