Richard M. Ryan is a professor at the Institute for Positive Psychology and Education at the Australian Catholic University and a research professor at the University of Rochester. He earned his Ph.D. in clinical psychology from the University for Rochester and his B.A. from the University of Connecticut. Ryan is a clinical psychologist and co-developer with Edward L. Deci, of Self-Determination Theory (SDT), one of the most influential theories of human motivation. SDT is a macrotheory of motivation, psychological development and wellness. The theory has spawned basic research on intrinsic and extrinsic motivation, and the facilitation and undermining of volitional motivation. SDT has been widely applied on research and interventions in work organizations, schools, clinical settings, virtual environments and sports, among other areas of application.