Dominic H. Lam is Professor of Clinical Psychology at the University of Hull. He has published extensively in various aspects of bipolar disorders and is the main author of the CBT for bipolar disorders trial. Steven H. Jones is Professor of Clinical Psychology and Director of the Spectrum Centre for Mental Health Research at Lancaster University. He has published widely on the development of cognitive therapy approaches for bipolar disorder and on psychological models relevant to the development and recurrence of bipolar experiences. Peter Hayward worked for many years at the Institute of Psychiatry and at the Maudsley Hospital. He is now retired but continues to practice CBT privately.