Stephen W. Porges (Author) Dr Stephen W. Porges is a psychiatrist, neuroscientist and pioneer of Polyvagal Theory. He is currently Distinguished University Scientist at Indiana University, where he is the founding director of the Traumatic Stress Research Consortium. Dr Porges is also the author of numerous articles and books on Polyvagal Theory. Karen Onderko (Author) Karen Onderko is a founding member of the Polyvagal Institute and is passionate about advancing the understanding and application of Polyvagal Theory. She promotes education and access to PVT for people throughout the world.