Donald Koppel (* 1941) has to go into hiding with his mother in Utrecht after his father is arrested by the Nazi occupiers in 1942 for an “economic offense” (possession of a bicycle), deported and finally murdered in the Mauthausen camp. Little Donald spends almost the entire war period with his mother, her parents-in-law and other relatives in hiding with the Toom family in Utrecht. This is how the Jews escape extermination. The time as an onderduiker does not remain without traces; after the liberation, Donald has great difficulties in social interaction with other children due to the years of isolation. After school and university, he worked as an economist and university lecturer. After the war, Donald Koppel remained in close contact with his rescuers in Utrecht, who gave him shelter; he also campaigned for them to be posthumously honored as “Righteous Among the Nations” by Yad Vashem in 1996.