Dennis J. Simon, PhD, is a licensed clinical and school psychologist with more than 3 decades of experience within elementary and secondary schools. For 4 years, he was director of NSSEO Timber Ridge Therapeutic Day School, a zero-reject public program serving the Chicago area. His career has centered on program development and psychological interventions for children and adolescents experiencing social, emotional, and behavioral disorders. Currently, he teaches courses at Loyola University of Chicago on therapeutic interventions, clinical supervision, and consultation for systems change. Dr. Simon is the lead author of the developmental/ecological/problem-solving model of clinical supervision that supports training in evidence-based intervention practices.