A.J. Drenth

Dr. A.J. Drenth is the author of "The 16 Personality Types." He is known for his work in personality psychology, particularly in relation to the Myers-Briggs Type Indicator (MBTI) and Jungian cognitive functions.

Drenth's approach focuses on providing comprehensive explanations of personality types based on functional stacks rather than just the four-letter codes.

He maintains a website called PersonalityJunkie.com, which serves as an additional resource for personality type information.

Drenth's writing style is described as academic and detailed, aimed at readers with some prior knowledge of personality theory.

His work is appreciated for its systematic approach to understanding and explaining the nuances of different personality types.