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Developed the 5 Hierarchy of needs from his work as a clinical psychologist and analyses of great people such as Eleanor Roosevelt, Thomas Jefferson, and Albert Einstein.
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The Human Side of Enterprise discusses McGregor's two theories on motivational psychology. Theory X is the "human-is-bad" thesis, where Theory Y is the philosophy that the "human-is-good."
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Created machine theory and summarized in in the six principles of Frederick Taylor's scientific management.
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Translated Maslow's hierarchy of needs into a content model of work motivation. He proposes a hierarchial relationship among organizational needs.