A beautiful mind
http://en.wikipedia.org/wiki/John_Forbes_Nash,_Jr.
http://www.math.princeton.edu/jfnj/
Game Theory, 1994 Laureate Nobel Prize Economics
Nash also did ground-breaking work in the area of real algebraic geometry:
"Real algebraic manifolds", Annals of Mathematics 56 (1952), 405–421. MR0050928 See also Proc. Internat. Congr. Math. (AMS, 1952, pp 516–517).