This document provides biographical information about John Amos Comenius, a 17th century Czech educator considered the "father of modern education". It discusses his major works that advanced educational theory and practice, such as Orbis Pictus and The Great Didactic. It also outlines some of Comenius' didactic theories, including the importance of teaching in the mother tongue and a gradual, illustrative approach. The document notes that Comenius remains an important symbol of Czech national identity and that Teachers' Day is celebrated on his birthday in the Czech Republic and Slovakia.