Michael B. First, M.D., is Professor of Clinical Psychiatry at Columbia University, and Research Psychiatrist in the Division of Behavioral Health Services and Policy Research Diagnosis and Assessment Lab at New York State Psychiatric Institute in New York, New York.Janet B. W. Williams, Ph.D., is Professor Emerita of Clinical Psychiatric Social Work (in Psychiatry and Neurology) at Columbia University, and Research Scientist and Deputy Chief of the Biometrics Research Department (Retired) at New York State Psychiatric Institute in New York, New York; and Senior Vice President of Global Science (Retired) at MedAvante Inc. in Hamilton, New Jersey.