Borderline pathology challenges the mental health field with its dynamic complexity and management difficulties. James F. Masterson, M.D., is a leading authority and pioneer in the diagnosis and treatment of the Borderline Disorder of the Self. His work is based on 30 years of intensive clinical experience and research, integrated with a synthesis of the major psychodynamic concepts, including developmental theory, object relations, and concepts of the Self. Masterson's specific theory and applied technique has proved uniquely effective in understanding and treating this controversial syndrome that has become central to psychotherapeutic concern.