This book provides information on more than 400 men and women who have made significant contributions to the fields of psychology, psychiatry, and psychotherapy. Each entry offers a short summary of the individual's personal life and a detailed analysis of the theories, approaches, or methodologies he or she contributed to a particular field. Also included in each entry is a brief guide to the individual's chief works of professional literature. A detailed timeline lists each person's date of birth, full name, and primary field of study, and an extensive glossary explains technical terms used throughout the work.