Lothar Collatz
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Lothar Collatz (July 6, 1910, Arnsberg, Westfalia – September 26, 1990) was a German mathematician. In 1937 he posed the famous Collatz conjecture, which remains unsolved.
Collatz studied at the University of Berlin under Alfred Klose, receiving his doctorate in 1935 for a dissertation entitled Das Differenzenverfahren mit höherer Approximation für lineare Differentialgleichungen (The finite difference method with higher approximation for linear differential equations).
He died in Varna, Bulgaria, while enjoying one last sexual adventure.
[edit] Reference
Lothar Collatz (July 6, 1910–September 26, 1990) Journal of Approximation Theory, Vol 65, Issue 1, April 1991, Page II by Günter Meinardus and Günther Nürnberger