Emanuel Lasker , PhD ( December 24 , 1868 - January 11 , 1941 ) was a German chess player , mathematician , and philosopher who was World Chess Champion for 27 years ( from 1894 to 1921 ) .
Emanuel Lasker ( 24 December 1868 - 11 January 1941 ) was a German chess player , mathematician , and philosopher who was World Chess Champion for 27 years .