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

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The modern psychodynamic theories of personality all originated from the work of Sigmund Freud, who created the first and most influential psychodynamic theory of personality. While subsequent theorists have made important changes and additions to his work, they are all fundamentally based on Freud's ideas.

From Which Individual's Work Did the Variety of Modern Psychodynamic