The father of the family that hides in the annex along with the Franks and who had worked with Otto Frank as an herbal specialist in Amsterdam. Mr. van Daan’s actual name is Hermann van Pels, but Anne calls him Mr. van Daan in the diary. According to Anne, he is intelligent, opinionated, pragmatic, and somewhat egotistical. Mr. van Daan is temperamental, speaks his mind openly, and is not afraid to cause friction, especially with his wife, with whom he fights frequently and openly. He dies in the gas chambers at Auschwitz in October or November of 1944.