Stephen W. Porges (* 1945) is an American psychologist and neuroscientist. He is the Professor of Psychiatry at the University of North Carolina at Chapel Hill. Porges is also currently Director of the Kinsey Institute Traumatic Stress Research Consortium at Indiana University Bloomington, which studies trauma. He was previously a professor at the University of Illinois, Chicago, where he was director of the Brain-Body Center at the College of Medicine, and at the University of Maryland. He proposed the unproven polyvagal theory in 1994.