Gaspard Monge
died 199 years ago
28th July 1818

Gaspard Monge is considered the father of differential geometry because of his work Application de l'analyse à la géométrie where he introduced the concept of lines of curvature of a surface in 3-space.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Monge.html