Dr. Friedrich Karl Stephan (born 27 May 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").
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