Hermann Minkowski (June 22, 1864 in Aleksotas/Russian Empire (today Kaunas, Lithuania), – January 12, 1909 in Göttingen) was a Lithuanian-born German mathematician who developed the geometry of numbers and who used geometrical methods to solve difficult problems in number theory, mathematical physics, and the theory of relativity. Wikipedia
The definitive Wikipedia entry for Hermann Minkowski. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Hermann_Minkowski