William D. James, MD, Paul R Gross, Professor of Dermatology, Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania; Dirk M. Elston, MD, Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina, Charleston, South Carolina, Former Director, Ackerman Academy of Dermatopathology, New York, New York; Timothy G. Berger, MD, Professor of Clinical Dermatology, Executive Vice Chair and Residency, Program Director, Chair in Dermatology Medical Student Education, University of California, San Francisco, San Francisco, California.