Chester H. Sunde, Psy.D.

Chester Chet Sunde, Psy.D., is a licensed clinical psychologist in Redding, California, specializing in PTSD treatment for combat veterans and first responders. He developed Platonomy, a therapeutic approach based on Plato's constitutional psychology that identifies a four-part model of the psyche, including the overlooked fourth element of constitutional governance (auto politeia).

Dr. Sunde created the SELF-RULE model as a practical framework for applying Platonic psychology in contemporary therapy. He published Plato's Super-Ego (Philosophical Practice, 2016); Platonomy: the Art and Science of Self-Governance on the Road to Eudaimonia (Philosophical Practice, 2025); and his book Platonomy: Ancient Wisdom for the Modern Self was released on May 29, 2025. His work demonstrates that Plato's Republic is primarily a psychological rather than political work, offering timeless insights for modern mental health.