Which theorist based his developmental theory on the premise that an individual does not and cannot exist apart from his or her relations with other people?

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Harry Stack Sullivan based his developmental theory on interpersonal relationships, emphasizing that an individual's personality and behavior are shaped by interactions with other people. Unlike other theorists who focused more on internal processes, Sullivan argued that people cannot be understood in isolation from their social context.

Which Theorist Based His Developmental Theory on the Premise That