# Nash, John Forbes Jr. (1928–2015)

John Nash was an American mathematician famously but not very accurately portrayed in the
Oscar-winning film *A Beautiful Mind* (2001), loosely based on the
biography of the same name by Sylvia Nasar (1998).^{1} Nash, who
worked in game theory and differential
geometry, shared the 1994 Nobel Prize in Economics with two other game
theorists, Reinhard Selten and John Harsanyi.

After a promising start to his mathematical career, Nash began to suffer from schizophrenia around the age of 30 and battled with the illness for the next quarter of a century. His Ph.D. dissertation, entitled "Non-cooperative Games," contained the definition and properties of what would later be called Nash equilibrium and the basis of the work that, 44 years later, would make him a Nobelist. Between 1966 and 1996, Nash published nothing. However, his mental health slowly began to recover in the mid-1990s, his ability to tackle mathematical problems returned, and he also became interested in computer programming.

### Reference

1. Nasar, Sylvia. *A Beautiful Mind: A Biography of John Forbes Nash,
Jr*. New York: Simon & Schuster, 1998.