Malcolm Knowles was an American educator best known for his work in the field of adult education. He introduced the concept of andragogy, which focuses on how adults learn differently from children. Knowles emphasized the importance of self-directed learning and the role of life experiences in shaping adult education. He developed several principles of adult learning, including the need for adults to understand the reasons for learning and the importance of practical, relevant content. His ideas have significantly influenced adult education practices and continue to be referenced in educational theory and practice today.