Prof. Stearns specializes in life history evolution, which links the fields of ecology and evolutionary biology, and in evolutionary medicine. He came to Yale in 2000 from the University of Basel, Switzerland, where he had been professor of zoology since 1983 and held several administrative posts.

His books include "Evolutionary Medicine" (Sinauer, 2015) with Ruslan Medzhitov, "Evolution, an introduction" (Oxford, 2000, 2nd Ed 2005) with Rolf Hoekstra, "Watching, from the Edge of Extinction" (Yale, 1999) with his wife Beverly Peterson Stearns, "The Evolution of Life Histories" (Oxford, 1992), and two edited volumes, "Evolution in health and disease" (Oxford, 1998, 2nd Ed 2008) and "The Evolution of Sex and its Consequences."

A 1967 graduate of Yale College, Stearns earned a M.S. from the University of Wisconsin and a Ph.D. from the University of British Columbia.  He was a Miller Fellow at the University of California, Berkeley, before taking up an appointment at Reed College prior to moving to Switzerland.

Prof. Stearns helped to found and served as president of the European Society for Evolutionary Biology, the Tropical Biology Association, and the International Society for Evolution, Medicine, and Public Health; he was founding editor of the Journal of Evolutionary Biology and of Evolution, Medicine, and Public Health.  He has been a vice president of the Society for the Study of Evolution and is a fellow of the American Association for the Advancement of Science.  In 2015 the University of Zurich awarded him an honorary degree.