Stanislaw Ulam

Stanislaw Marcin Ulam (pronounced ; 13 April 1909 – 13 May 1984) was a Polish-American mathematician. He participated in America's Manhattan Project, originated the Teller–Ulam design of thermonuclear weapons, invented the Monte Carlo method of computation, and suggested nuclear pulse propulsion. In pure and applied mathematics, he proved some theorems and proposed several conjectures.