Who may have actually been responsible for the defense mechanisms?

Question

Quizplus · Accepted Answer

Anna Freud, being the daughter of Sigmund Freud and a prominent psychoanalyst herself, worked extensively on the defense mechanisms in her own psychoanalytic theories and practice. While Adler and Jung were contemporaries of Freud and also developed their own theories, defense mechanisms were not a primary focus in their work. Josef Freud is not a known figure in the field of psychology or psychoanalysis.

Who May Have Actually Been Responsible for the Defense Mechanisms