The Thinking Type stands as one of the four primary functional typologies elaborated by Jung in the 1921 Psychological Types, and its treatment across the depth-psychology corpus reveals a term of considerable diagnostic, clinical, and theoretical consequence. Jung’s foundational distinction between extraverted and introverted variants of the type generates two quite different portraits: the extraverted thinking type, oriented toward objective data, social order, and institutional authority, and the introverted thinking type, driven by subjective ideas and archetypal images that may resist empirical verification. Von Franz, in her lectures and in Psychotherapy, provides the richest clinical elaboration, tracing the characteristic inferior feeling of both variants—its archaic quality, its black-and-white judgments, its hidden sentimentality—and demonstrating how this inferiority shapes neurotic and compensatory dynamics. Thomson and Beebe extend the discussion into MBTI-adjacent and post-Jungian territory, nuancing the relationship between extraverted thinking as a function and the typed individual who deploys it. Sharp, Hollis, and Quenk emphasize the functional hierarchy and the consequences of suppressing the inferior function. Taken together, the corpus treats the Thinking Type not as a fixed characterological destiny but as a dynamic structure whose pathologies, compensations, and developmental possibilities are as instructive as its adaptive strengths.