According to the Bundesarchiv Gedenkbuch Siegdried Wolff came to the Netherlands on August 29th, 1939.
Between October 1940 and December 1942 he was the head of the "Jongenshuis" in Arnhem: a facility for refugee children.
Again according to the Gedenkbuch he was deported from Westerbork to Therezin on September 4th, 1944 and from there to Auschwitz on October 12th, 1944.
Verhaal