He was Senior Psychologist at the Perception Laboratory of the Menninger Foundation. A graduate of Columbia University in 1942 with the Ph.D., and a diplomate in clinical psychology, Dr. Klein is a national leader in the field of perception, and an authority on the function of perception in personality. He is author of many scientific journal articles, and coeditor of the book, Theoretical Models and Personality Theory. He has also contributed an important chapter to Blake and Ramsey's Perception: An Approach to Personality.Stating that the many concentrated man-hours of study which the issue of motivated perception has inspired were generated by clinicians, personality theorists and social psychologists, Dr. Klein gives a terse developmental history of the perception-motivation approach to personality. He points out that perceptual theories, which had been protected by a tradition of psychophysical methodology, were, to a great extent, first attacked by the work of Murphy, Goldstein and Allport. The attack was further inspired by psychoanalytic principles, by the clinical diagnostic work with tests by Rapaport and Schafer, and by the work of Bartlett and Sherif in the area of social psychology.Klein believes that there has been too much emphasis of relatively simple, perceptual problems at the expense of the more complex, cognitive processes. These latter, of course, involve not only the perceptual processes, but numerous motivational factors as well. From this point of view, Klein has reviewed and analyzed much of the salient work in the field of perception; he has organized and refined many of these concepts and has integrated them with his own thinking to provide an interesting and stimulating approach to understanding personality. I am greatly indebted to Dr. Robert R. Holt and Dr. David Rapaport for their many stimulating and invaluable comments on this paper.