---
id: people/jay-forrester
about:
  label: Jay W. Forrester
  description: >-
    American engineer and MIT professor (1918 to 2016) who founded system
    dynamics and used it to model a firm, a city and the whole world.
  tags:
    - system dynamics
    - feedback
    - world model
person:
  affiliation: MIT Sloan School of Management
  role: founder of system dynamics
provenance:
  origin: agent
  sources:
    - title: Jay Wright Forrester (Wikipedia)
      url: 'https://en.wikipedia.org/wiki/Jay_Wright_Forrester'
    - title: >-
        Professor Emeritus Jay Forrester, digital computing and system dynamics
        pioneer, dies at 98 (MIT News, 2016)
      url: >-
        https://news.mit.edu/2016/professor-emeritus-jay-forrester-digital-computing-system-dynamics-pioneer-dies-1119
  created: '2026-11-02'
  reviewed: '2026-11-02'
  reviewed_by: 'Claude, from the sources listed'
  status: draft
---
Jay Wright Forrester was born in Nebraska on 14 July 1918 and died on 16 November 2016, aged 98.[^1,2] He spent his whole career at MIT, arriving as a graduate student in 1939 and retiring in 1989.[^1,2] After the war he led Project Whirlwind, one of the first digital computers, and in 1949 invented magnetic core memory, an early form of RAM.[^1,2]

In 1956 he moved to what became the MIT Sloan School of Management and turned to the behaviour of organisations.[^1,2] There he developed system dynamics, which describes a system as stocks that rise and fall through flows and feedback loops, and simulates it on a computer.[^1,2] His book Industrial Dynamics (1961) used it to show that swings in a firm's inventory came from its own management practices, not from the market.[^1,2] He also created the supply-chain exercise later known as the Beer Game.[^2]

He then applied the method to a city in [Urban Dynamics](/media/urban-dynamics/) (1969) and to the planet in [World Dynamics](/media/world-dynamics/) (1971), an integrated model of population, resources and economic growth.[^1,2] World Dynamics was the starting point for the World3 model of [The Limits to Growth](/media/the-limits-to-growth/), written in 1972 by four of his students.[^1,2] His 1971 paper Counterintuitive Behavior of Social Systems argued that computer models of social systems expose the assumptions that people leave unstated in debate.[^1]

On the wiki, [Incrementalism and complexity](/articles/bogucki-incrementalism-complexity/) dates his system dynamics to the 1950s, and the System Dynamics Society award named after him appears in the entry on [Stella Architect](/engines/stella-architect/).