3. John Forrester

John Forrester was an influential figure in the field of systems dynamics, which uses models to understand complex systems and their behaviors over time. He is best known for developing the "Stock and Flow" diagram, a tool that helps visualize how different components within a system interact. His work emphasized the importance of feedback loops in processes like population growth and resource management. Forrester's contributions extend beyond academia, impacting fields such as business, economics, and environmental science, where understanding systemic relationships is crucial for effective decision-making.