Dr. Wilen received his A.B in Biology and Economics at Washington University in St. Louis, his MD and PhD from the University of Pennsylvania. His residency training was in clinical pathology at Barnes-Jewish Hospital in St. Louis, MO. His postdoctoral studies were conducted in the laboratory of Herbert "Skip" Virgin in the Department of Pathology & Immunology at Washington University School of Medicine where he studied the pathogenesis of norovirus, the leading cause of acute gastroenteritis globally. Specifically, he discovered CD300lf as the first receptor for a norovirus and identified intestinal tuft cells as the physiologic target cell for mouse norovirus infection. Dr. Wilen is currently an Assistant Professor in Laboratory Medicine and Immunobiology.