Michael Berk is a professor of psychiatry at Barwon Health and The Geelong Clinic at The University of Melbourne, Australia, and heads the bipolar program at Orygen Research Centre. David Castle is a professor of psychiatry at St. Vincent's Health and The University of Melbourne. He has published widely in prestigious scientific journals and coauthored 13 books. Sue Lauder is a clinical psychologist and has worked in private practice as well as a variety of clinical research settings.