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All four authors are clinical psychologists. Peter M. Lewinsohn, Ph.D., is a professor of psychology at the University of Oregon. His colleagues are also faculty members in psychology: Ricardo F. Munoz, Ph.D., is at the University of California, San Francisco, Medical School; Mary Ann Youngren, Ph.D., is at Willamette University in Oregon; and Antonette M. Zeiss, Ph.D., is at the V.A. Hospital in Palo Alto, California.