In late 1940 Otto Franks’ firm moves from Singel 400 to Prinsengracht 263 in Amsterdam. Soon afterwards Otto Frank employs Johannes Kleiman. Miep Gies says of him in her book ' Anne Frank Remembered':

‘Shortly after we moved Mr Frank took a middle-aged Dutch gentlemen into the company. His name was Mr Jo Koophuis. He had various business dealings with Mr Frank over the years and seemed to be a personal friend as well. Koophuis was a frail-looking, pale-faced man, with large, thick glasses, a pinched nose and a delicate look. He was a quiet person whose personality immediately inspired feelings of trust and kindness. Koophuis and I quickly established a warm rapport.’