Hermann came to the Netherlands on January 4th, 1939 with a Kindertransport. First he stayed at the Zeehuis in Bergen aan Zee, and in March 1939 he went to the boys orphanage in Amsterdam.
His father was a salesman and managed to get to Colombia or Bolivia. The intention was that his mother, Auguste Katzenstein, born on January 26th, 1904 in Gottingen, was also going to Colombia. However, she was deported from Kassel to Terezin in September 1942, and from there to Auschwitz in January 1943 (Gedenkbuch).
Source: National Archives, 2.04.58, inv. 130 and others
Addition