Norman E. Rosenthal, MD, is internationally recognized for his pioneering contributions to understanding SAD and using light therapy to treat it. He is Clinical Professor of Psychiatry at Georgetown Medical School, a therapist in private practice, and the author of six other books, including Winter Blues, the New York Times bestseller Transcendence: Healing and Transformation Through Transcendental Meditation, and The Gift of Adversity. Dr. Rosenthal conducted research at the National Institute of Mental Health for over 20 years and is a highly cited researcher.

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Christine M. Benton is a Chicago-based writer and editor.

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