Drucker refers to Peter Drucker, an influential management consultant, educator, and author, known for his contributions to modern management theory. He introduced concepts such as "management by objectives" and emphasized the importance of innovation and entrepreneurship in organizations. Drucker's work has shaped how businesses operate and how managers think about their roles. Drucker wrote numerous books, including "The Practice of Management" and "Management: Tasks, Responsibilities, Practices," which are considered foundational texts in the field. His ideas have influenced various sectors, including business, nonprofits, and government, making him a key figure in the development of management as a discipline.