Friedrich "Fritz" Pfeffer (30 April 1889 – 20 December 1944) was a German dentist and Jewish refugee who hid with Anne Frank during the Nazi Occupation of the Netherlands, and who perished in the Neuengamme concentration camp in Northern Germany. Pfeffer was given the pseudonym Albert Dussel in Anne's diary, and remains known as such in many editions and adaptations of the publication.
Upon receiving the confirmation of Pfeffer's death, Charlotte Kaletta decided on a posthumous marriage. Otto Frank, the father of Anne Frank, helped her in the legal process. She was married to Pfeffer from 1953 to her death in 1985.
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Before World War II, Pfeffer and Charlotte Kaletta were planning to get married. After the war broke out, he was forced to go hiding. The Nazis didn't discover the hiding place until in August 1944, but within a month he was sent to a concentration camp and killed there.
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Hid with Anne Frank's family and three others from the Nazis.
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