John von Neumann (1903-1957) is best known as a mathematician and one of the leading figures in early 20th century mathematics. During World War II, he played an important role in atomic research.

Von Neumann was born in Budapest, Hungary on December 28, 1903 to Neumann János Lajos (1873-1928), who was a wealthy banker, and Cecília Karsay de Felsö-Szilvás (1875-1964).

In 1945 von Neumann joined the atomic bomb project and by 1950 he had helped develop the hydrogen bomb under Enrico Fermi at Los Alamos National Laboratory.

John Von Neumann was married to his first wife, Marietta Kovesi for eight years until her death in 1953 when he was 48. He then married Marina Berberova and they remained together until his death in 1957 at the age of 53.