Edgar H. Schein is an American former professor at the MIT Sloan School of Management who has made a significant impact on the field of organizational development, culture, and leadership. Born in 1928, Schein is best known for his work on the theory of organizational culture, and he has written extensively about the dynamics of corporate and workplace cultures. His most influential concept is perhaps the "Schein's Model of Organizational Culture," which suggests that culture consists of three levels: artifacts, espoused values, and basic underlying assumptions. Schein's contributions to the understanding of how culture operates within organizations, and how it can be changed, have been invaluable in both academic and practical contexts. His books, such as "Organizational Culture and Leadership" and "Process Consultation," are considered seminal texts in the field of organizational psychology and management studies.