In the decade before he became the highly controversial director of psychedelic drug research at Harvard, Timothy Leary was one of the leading clinical psychologists practicing in the U. S. , heading the prestigious Kaiser Foundation Psychological Research Center in Oakland. INTERPERSONAL DIAGNOSIS OF PERSONALITY (1957), his first full-length book, summarizes the innovative experimental studies in interpersonal behavior performed by the author and his associates at the Kaiser Foundation and in private practice between 1950 and 1957.