The state-certified infant sister Klara Hartogsohn worked for a month at the Home of the Jewish Women’s Association in Neu-Isenburg, just before her escape from Germany. The then 41-year old was born in Emden. She completed her practical training as a teaching sister at the Jewish Hospital in Breslau and later at a Jewish children's home in Berlin, where she took her exam in 1920 and received her diploma. She worked mostly in households as a children’s nurse. In the 1930s she lived and worked in Delmenhorst from 1931 to 1938, then one year in Hannover, before she moved to Frankfurt am Main in March 1939.

After the Nazi takeover, their income decreased sharply because Jewish families emigrated or were robbed financially so strong that they could not afford any more children, and nurses. Families hired more non-Jewish nurses but not Jewish children’s nurses. Klara Hartogsohn decided to emigrate to the United States but didn’t receive a visa, so she fled to England. Her brother was deported from England as an "enemy alien" to Canada. When he was released there later, he settled in Canada. Then Klara Hartogsohn emigrated to Canada in 1951, where she lived in her brother’s household in Montreal.

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