Siméon Denis Poisson
21 June 1781 — 25 April 1840
Baron Siméon Denis Poisson was a French mathematician and physicist who worked on statistics, complex analysis, partial differential equations, the calculus of variations, analytical mechanics, electricity and magnetism, thermodynamics, elasticity, and fluid mechanics. Moreover, he predicted the Arago spot in his attempt to disprove the wave theory of Augustin-Jean Fresnel.
A memorial on Digital Cemetery, an endless map you can explore. This grave stands at coordinates 19, -32.