From which individual's work did all modern psychodynamic theories of personality derive from

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All modern psychodynamic theories of personality derive from the work of Sigmund Freud, who developed the concept of the unconscious mind, the role of childhood experiences in shaping personality, and the use of techniques such as free association and dream analysis in therapy. While other theorists, such as Karen Horney, have contributed to the development of psychodynamic theories, their work is still built upon the foundational ideas and principles established by Freud.

From Which Individual's Work Did All Modern Psychodynamic Theories of Personality