Stanislaw Marcin Ulam

(1909-1984) - with his brother Adam Bruno Ulam came to US in 1936. He was a member of the Manhattan Project, which produced the first atom bomb, 1943-45, and from 1946 collaborated with Edward Teller on the design of the hydrogen bomb, solving the problem of how to ignite the bomb. All previous designs had collapsed. He also devised the 'Monte-Carlo method' widely used in solving mathematical problems using statistical sampling.

Biography
Race for the Superbomb | Stanislaw M. Ulam
Stanislaw Marcin Ulam Papers
Ulam Quarterly Journal
Biography and works from wikipedia

Books
Adventures of a Mathematician by Stanislaw M. Ulam
Mathematics and Logic by Mark Kac, Stanislaw M. Ulam
Science, Computers, and People : From the Tree of Mathematics by Stanislaw M. Ulam, Mark C. Reynolds, Gian-Carlo Rota
Stanislaw Ulam: sets, numbers, and universes; selected works by Stanislaw M. Ulam

Stanislaw Ulam at amazon