John Mezirow is an American educator best known for his work in adult education and transformative learning theory. He developed the concept of transformative learning, which emphasizes how individuals can change their perspectives and beliefs through critical reflection and experience. This theory has influenced various fields, including education, psychology, and social change. Mezirow's ideas highlight the importance of critical thinking and self-reflection in learning processes. His work encourages adults to question their assumptions and engage in dialogue with others, fostering personal growth and deeper understanding. His contributions have made a significant impact on the field of adult education and continue to inspire educators worldwide.