Who is Herr Kremer from The Last of the Just and what is their importance?

Herr Kremer is Ernie's teacher. He does not understand or agree with the policies of Fascism, and initially believed that Facism would be a passing fad. The organization of the Nazi party is unacceptable to Kremer, and he does all he can to protect the Jewish children at school and extoll peace. Kremer is later removed from his position.