Six Phases in the Development of Jung's Theory of Types
"[...] a few years ago there was a debate about whether Jung himself was an INTP or INTJ.
It was fueled, in part, by a misunderstanding arising out of the MBTI premise that people inadvertently and mistakenly attribute to Jung: namely,
that no individual could (on theoretical grounds) simultaneously have introverted intuition and introverted thinking as dominant and auxiliary functions.
Ironically, Jung was just such a person and thus did not fit well into either MBTI category - INTP or INTJ.
And the possibility that introverted thinking and introverted intuition were Jung's dominant/auxiliary functions,
ironically never occured to those who sought to type him."