Peter F. Drucker was a prominent management thinker who made significant contributions including defining the nature and role of management, the manager's job, business objectives and social responsibilities, entrepreneurial functions, management by objectives, organization structure, and decision making. Michael Porter developed theories around five forces analysis, generic competitive strategies, value chain analysis, and competitive advantage. The document discusses two influential management thinkers, Peter Drucker and Michael Porter, and their key contributions to the field of management theory.