Forrester is considered the inventors of system dynamics, which deals with the simulation of interactions between objects in dynamic systems. He has written several books and papers on system principles and dynamics. He is currently Germeshausen Professor Emeritus and Senior Lecturer at MIT's Sloan School of Management.
He wrote a book "World Dynamics" on modelling the world economy, population and ecology. The paper "A Dynamic World Model" by D. H. Brownlee (in American Society for Engineering Education Transactions on Computers in Education 1973 Vol. 5) implements this model on an analogue computer. It concludes that the only hope for mankind is massive depopulation resulting from a nuclear war!