Bernard Bolzano

Bernard Bolzano (, ; ; ; born Bernardus Placidus Johann Nepomuk Bolzano; 5 October 1781 – 18 December 1848) was a Bohemian mathematician, logician, philosopher, theologian and Catholic priest of Italian extraction, also known for his liberal views.

Bolzano wrote in German, his native language. For the most part, his work came to prominence posthumously. Provided by Wikipedia