High Quality Content by WIKIPEDIA articles! INFJ (introversion, intuition, feeling, judging) is an abbreviation used in the publications of the Myers-Briggs Type Indicator (MBTI) to refer to one of the sixteen personality types. The MBTI assessment was developed from the work of prominent psychiatrist Carl Jung in his book Psychological Types. Jung proposed a psychological typology based on the theories of cognitive functions that he developed through his clinical observations.