In this issue of JAMA, we announce an initiative designed to expand the publication of Commentaries covering important, timely issues in medicine and public health. To achieve this goal, we are pleased to welcome the following group of Contributing Writers to JAMA: Christine K. Cassel, MD, from the American Board of Internal Medicine; Allan S. Detsky, MD, PhD, from the Departments of Medicine and of Health Policy, Management, and Evaluation, University of Toronto; Ezekiel J. Emanuel, MD, PhD, from the Department of Clinical Bioethics, The Clinical Center, National Institutes of Health; Lawrence O. Gostin, JD, LLD, from the O’Neill Institute for National and Global Health Law, Georgetown University Law Center; and Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health; Kevin Grumbach, MD, from the Department of Family and Community Medicine, University of California, San Francisco; Howard Markel, MD, PhD, from the Center for the History of Medicine, University of Michigan; and Bruce M. Psaty, MD, PhD, from the Cardiovascular Health Research Unit, and the Departments of Medicine, Epidemiology, and Health Services, University of Washington.