David West Keirsey, PhD (b. August 31, 1921, Oklahoma), is an internationally renowned psychologist, a professor emeritus at California State University, Fullerton, and the author of several books. In his most popular publications "Please Understand Me" (1978, co-authored by Marilyn Bates) and the revised and expanded second volume "Please Understand Me II" (1998), he lays out a self-assessed personality questionnaire, … Wikipedia
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