Jules Seeman is one of the earliest representatives of humanistic-experiential psychotherapy and research. He is the recipient of numerous local and national honors, including the American Psychological Association Division 32 Carl Rogers Award for his outstanding contribution to the profession and practice of humanistic psychology. Dr. Seeman spent six years with Carl Rogers at the University of Chicago Department of Psychology and the Counseling Center, and then came to Peabody College of Vanderbuilt University. In his work, he was especially drawn to the area of what Rogers referred to as the "fully functioning person" and over a lifetime of research and practice, developed the "human system model" of psychotherapy and optimal functioning. In the present volume, Dr. Seeman illustrates how central elements of a person's behavioral systems are integrally linked, and how it should be possible to intervene at different points of the human system to affect other behavioral systems within the person. Using detailed narratives and integrates an understanding of therapy and research in a way that exemplifi es the scientist-practictioner model. Dr. Seeman provides a well conceptualized and empirically supported view of what makes the human system function well and thus for understanding the place of psychotherapy in enhancing personal efficacy.