The psychodynamic theorist who proposed the idea of a collective unconscious that is shared by all members of the human species is Carl Jung. He believed that the collective unconscious is a part of the unconscious mind that is genetically inherited and common to all humans, containing shared memories, archetypes, and ancestral experiences. This idea distinguishes the collective unconscious from the personal unconscious, which is shaped by individual experiences. Jung introduced this concept as part of his analytical psychology and considered it foundational in understanding universal themes and symbols in human psyche and culture.