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Richard G Stevens is professor of Community Medicine in the School of Medicine at the University of Connecticut. He received a B.S. in Genetics from University of California, Berkeley, and a PhD in Epidemiology from University of Washington (Seattle). His primary research interest began in 1987 when he published a radical new theory that use of electric lighting, resulting in lighted nights, might produce "circadian disruption" causing changes in the hormones relevant to breast cancer risk. Accumulating evidence has generally supported the idea, and it has received wide scientific and public attention.