Friedrich Stephan

Dr. Friedrich Karl Stephan (born May 27, 1941) is an American academic who is a circadian physiologist. He is the Curt P. Richter Distinguished Professor of Psychology & Neuroscience at Florida State University. His research focuses on localization and function of biological clocks in vertebrates, light and food as entraining signals for circadian rhythms, obesity,^[1] sleep, and reproduction.^[2] He is credited as the discoverer of the suprachiasmatic nucleus ("body clock").^[3]