Peter Drucker (1909-2005) was a pioneering writer and consultant regarded as the father of modern management, contributing extensively through his 39 books and numerous articles on organizational structure in various sectors. His key concepts include treating workers as assets, promoting decentralization, and the practice of management by objectives (MBO). Drucker's insights remain influential in management theory and practices, emphasizing the importance of clear objectives, strategic decision-making, and effective communication.