Inventor of the Nash equilibrium theory. Did some seminal work on Game
See url: http://en.wikipedia.org/wiki/John_Forbes_Nash,_Jr.
For his "Dear John" letters from the NSA regarding his encryption machine.
see url: http://cryptome.org/2015/05/nash-letters.pdf
He was the subject of a film called "Beautiful Mind" which starred Russell
See url: http://en.wikipedia.org/wiki/A_Beautiful_Mind_%28film%29
Not being a mathematician or a game theorist, I haven't a clue whether his
encryption machine or game theory or equilibrium theory works, or has any
value. I will leave that judgement up to greater minds... J.