Janusz Korczak (the pen name of Henryk Goldschmidt, 1878-1942), is a prominent Polish-Jewish writer. He was famous not only for his novels; he was also a paediatrician, educator and social activist. He became famous as a theoretician and practitioner in the field of Education. He was the inventor of an original system of working with children, which was based on partnership, self-governing institutions and procedures, and the promotion of self-education. As a researcher delving in the child’s world, he pioneered the development of educational diagnostic activities and became a precursor of children’s rights.