Jay Wright Forrester

Founder of System Dynamics, Forrester was also a pioneer computer engineer and systems scientist whose invention of magnetic core memory transformed computing.

Forrester was born on July 14, 1918, on a cattle ranch near Anselmo, Nebraska. He developed an early interest in electronics and built a wind-powered electrical system for the ranch as a teenager. He went on to study electrical engineering at the University of Nebraska, graduating in 1939, before pursuing graduate work at MIT under Gordon Brown.

During World War II, Forrester worked on servomechanism research and helped develop early analog computers for gun control systems. After the war, he led the Whirlwind project at MIT, which produced one of the first high-speed digital computers capable of real-time computation. His most celebrated technical contribution from this period was the invention of magnetic core memory, which became the dominant form of random-access computer memory for nearly two decades.

In the 1950s, Forrester shifted his focus toward the application of computer modeling to complex social and organizational systems. He joined the MIT Sloan School of Management and founded the field of System Dynamics, developing methods to simulate feedback loops and time delays in industrial and economic processes. His 1961 book, *Industrial Dynamics*, described the foundational principles of this new discipline.

Forrester later extended System Dynamics to urban planning and global modeling, influencing prominent works such as *The Limits to Growth*. He received numerous honors throughout his career, including the National Medal of Technology in 1995. He died on November 16, 2016, at the age of 98.