David Keirsey

David Keirsey was an American psychologist and professor emeritus at California State University, Fullerton, renowned for his work adapting the Myers-Briggs Type Indicator into a temperament classification system with four psychological temperaments and sixteen personality types. He authored influential books such as 'Please Understand Me' and 'Please Understand Me II', which popularized his typology of human personalities. Keirsey's research significantly impacted the fields of personality psychology and organizational behavior.