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Richard F. Spark, MD, FACE, is an associate clinical professor of medicine at Harvard Medical School and director of the Steroid Research Lab at Boston's Beth Israel Deaconess Medical Center. The author of books on male sexuality and fertility, Spark has written for the New York Times and The New Republic on health-related issues and is widely published in major medical journals. He is a fellow of the American College of Endocrinology and a member of the Endocrine Society, the Andrology Society, and the Federation of Clinical Research.