Otto Frank was a German businessman born on May 12, 1889, in Frankfurt, Germany. He is best known as the father of Anne Frank, a Jewish girl who gained fame posthumously with the publication of her diary, which documents her life in hiding during the Holocaust. Otto was the only member of his family to survive the concentration camps. After the war, Otto Frank returned to Amsterdam, where he discovered Anne's diary, which had been saved by Miep Gies, a family friend. He worked to publish the diary, titled The Diary of a Young Girl, which has since become a significant work in Holocaust literature and a symbol of the human spirit.