John Alcorn, PhD is a scientist at UPMC Children's Hospital of Pittsburgh and an associate professor in the University of Pittsburgh School of Medicine. The Alcorn lab is focused on T cell immunity, host defense, epithelial cell biology, and lung physiology. A primary lab focus is on Influenza infection and the host defense mechanisms of T helper 17 cells. His lab has recently shown that the TH17 effector cytokines IL-17 and IL-22 are required for host defense against a variety of extracellular pathogens.