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Andragogy has a long and rich history that has shaped understanding of adult learning and continues to be a strong force in guiding the way adults learn. While adult educators in the U.S. are familiar with andragogy through the work of Dr. Malcolm Knowles, the theory of andragogy reaches a worldwide audience of practitioners striving to improve learning through its respectful and engaging method focused on the learner.
John A. Henschke (Sat,) studied this question.