In this, his fourth book published by Academic Press, the author pursues current theories in the expansive field of personality research. Presenting a unique perspective on recent developments in the field, the book is an invaluable resource for both graduate students and researchers in the study of personality. The author's emphasis is on empirical research; he presents a limited number of topics in detail, and often includes a presentation of the data obtained in individual studies, in order to illustrate the importance of those studies to the larger topic of personality. Topics discussed include stability and change in traits, the behavior genetics of traits, a review and defense of trait theory, and a comprehensive review of research on the unconscious.