As a professor he was not even permitted a typewriter. Married to a non-Jew he was allowed to continue to live in Dresdan and not sent on the death transports to the “East.”
Long after the war it was thought his secret diaries were lost. But on his death his wife gave the diaries to the Dresdan Archive where they stayed until published in 1995.
–“I Will Bear Witness” by Victor Klemperer