John G. Gunderson, M.D., is Professor of Psychiatry, Harvard Medical School, and Director, BPD Center for Treatment, Research and Training, McLean Hospital, Belmont, Massachusetts.

Paul Links, M.D., M.Sc., F.R.C.P.C., is Professor and Chair, Department of Psychiatry, Schulich School of Medicine and Dentistry, The University of Western Ontario, and Chief of Psychiatry, London Health Sciences Centre and St. Joseph's Health Care, London, Ontario.