Johannes Kleiman

Johannes Kleiman (17 August 1896 – 28 January 1959) was a Dutch resident who helped hide Anne Frank and her family in the Netherlands in World War II. In the published version of Frank's diary, Het Achterhuis, known in English as The Diary of a Young Girl, he is given the pseudonym Mr. Koophuis. In some later publications of the diary, the pseudonym was removed (just like the other protectors' pseudonyms), and Kleiman was referred to by his real name.

Kleiman was born in Koog aan de Zaan, the Netherlands, and met Otto Frank in 1923, when he was trying to establish a branch of the Michael Frank Bank in Amsterdam. Kleiman was registered as a proxy for the bank in May 1924 and given full powers in December of that year when the bank went into liquidation. He was hired by Frank as a bookkeeper for Opekta and Pectacon in 1938, but had become a close friend from about 1933, when the Frank family fled to the Netherlands to escape Nazi persecution in Germany.

Johannes Kleiman became a member of the board of Opekta and the company was established at his home address for the next five months until it moved to Prinsengracht 263 at the end of 1940. He officially joined as bookkeeper for both Opekta and Pectacon, with Victor Kugler and secretary Bep Voskuijl for Pectacon, and Otto Frank and his secretary Miep Gies for Opekta.