Johannes Kleiman was one of the Dutch residents who helped hide Anne Frank and her family during the Nazi occupation of the Netherlands. In the published version of Frank's diary, The Diary of a Young Girl, he is given the pseudonym Mr. Koophuis. In some later publications of the diary, the pseudonym was removed, and he was referred to by his real name. Kleiman became a close friend of the Frank family when they fled to the Netherlands in 1933.