Stevan J. Arnold, emeritus professor of integrative biology at Oregon State University, has been elected to the US National Academy of Sciences, one of the highest honors in science.
Arnold is an evolutionary biologist whose work has been central to advancing how scientists measure natural and sexual selection. His research developed quantitative approaches for analyzing how multiple traits evolve together, bringing precision to questions that had long been difficult to answer in natural populations. By linking mathematical theory with field-based studies, he clarified how behavior, morphology and fitness to shape the evolution of functional complexes. His empirical work features studies of reptiles and amphibians, including long-term research on the microevolution of garter snakes and sexual communication in salamanders.
He joined Oregon State in 1997 as professor of zoology and served as chair of the Department of Zoology. He also played a key role in fostering the university’s natural history collections, serving as curator of amphibians and reptiles and as director of the Oregon State Arthropod Collection.
Arnold also helped train the next generation of evolutionary biologists, serving as a faculty sponsor on numerous doctoral and postdoctoral awards and co-organizing a long-running workshop on evolutionary quantitative genetics. He retired in 2019.
“The College of Science is proud to see Stevan J. Arnold’s work recognized at this level," said Dean Eleanor Feingold. "His work has had a lasting impact on evolutionary biology, and at Oregon State he helped build research and collections that continue to support the research and our students.”
Arnold’s contributions have been recognized with numerous honors from leading scientific societies, including his election as a fellow of the American Academy of Arts and Sciences. He has also served as president of the Society for the Study of Evolution and the American Society of Naturalists.
