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</ref> and the application of operator theory to quantum mechanics called von Neumann algebra.  He was a member of the [[Manhattan Project]] who later worked with [[Edward Teller]] and [[Stanislaw Ulam]] to develop the steps for thermonuclear reactions necessary to build the hydrogen bomb.

</ref> and the application of operator theory to quantum mechanics called von Neumann algebra.  He was a member of the [[Manhattan Project]] who later worked with [[Edward Teller]] and [[Stanislaw Ulam]] to develop the steps for thermonuclear reactions necessary to build the hydrogen bomb.

Among mathematicians, John von Neumann probably had the greatest influence on the world in the 20th century, according to the ''Encyclopedia Britannica''.<ref>http://www.britannica.com/EBchecked/topic/632750/John-von-Neumann/256595/Later-years-and-assessment</ref>

Among mathematicians, John von Neumann probably had the greatest influence on the world in the 20th century, according to the ''Encyclopedia Britannica''.<ref>https://www.britannica.com/EBchecked/topic/632750/John-von-Neumann/256595/Later-years-and-assessment</ref>

==Religion==

==Religion==

John von Neumann was born to a non-practicing [[Judaism|Jewish]] family but still had a ritual circumcision, he later converted to [[Roman Catholicism]]; After being agnostic for much of his life, von Neumann surprised non-believers by requesting to see a Catholic priest as von Neumann approached death with sound mind in his mid-50s.

John von Neumann was born to a non-practicing [[Judaism|Jewish]] family but still had a ritual circumcision, he later converted to [[Roman Catholicism]]; After being agnostic for much of his life, von Neumann surprised non-believers by requesting to see a Catholic priest as von Neumann approached death with sound mind in his mid-50s.