She was hired by Otto Frank in 1937 as a secretary and by 1942 was the administration manager of his company, Opekta, based at 263 Prinsengracht, the address which would become the Frank family's hiding place.
Ea a fost angajată de către Otto Frank în 1937 ca secretară și prin 1942 era director administrativ al companiei acestuia, Opekta, cu sediul pe Prinsengracht 263, unde se afla ascunzătoarea familiei Frank.