This document discusses several influential management thinkers from the modern period, including: - Lyndall Urwick who extended Henri Fayol's thoughts and established six principles of management and 29 principles for organization. - Herbert Simon who studied decision-making processes and bounded rationality. He introduced concepts like administrative man and organizational communication. - Peter Drucker who developed concepts like management by objectives and coined the term "knowledge worker." - C.K. Prahalad who introduced the idea of core competencies, skills that are valuable, rare, and difficult for competitors to imitate. - Michael Porter who created Porter's diamond model to analyze national competitive advantage.