Who Invented Extraversion and Introversion?

Carl Jung. Carl Jung was one of the first people to define the terms introvert and extrovert in a psychological context. According to Jung (1910; 1923), personality is based on four pairs of opposing types.

Who discovered extraversion?

One of the first times Carl Jung introduced the term is in 1917, in his book "Die Psychologie der Unbewussten Prozesse", he spelled it "ExtrAvert".

Where did introversion come from?

The term introversion was popularized by Carl Jung and suggests an inwards orientation to one's own mental life rather than the outward orientation of extroverts to social life. Introverts gain energy from reflection and lose energy in social gatherings.