Wilhelm Steinitz (Prague, 1836 - New York, 1900) world champion between 1866 and 1894.
He laid down the base of positional game, therefore known as the founder of the modern chess.
Link to E4EC
Yes, we'd appreciate it if you want to link to e4ec.org from your own website.
You can use this graphic and link if you want to create a graphical link...
Dmitriy Ivanovich Mendeleev (1834-1907) is best known for devising the Periodic Table of Chemical Elements.
He loved to play chess, among other games, and correspondence chess too. A beautiful but hard chess problem follows from him from July 4, 1889, white mates in two: