John Nash (1928-2015) was a mathematician famous for his work in game theory and Riemannian geometry. He made seminal contributions to game theory, including the concept of the Nash equilibrium. Nash suffered from schizophrenia from the 1950s but recovered in the late 1980s. He went on to receive the Nobel Prize in Economics in 1994 and the Abel Prize in 2015 for his achievements in mathematics.