Otto Hermann Kahn (February 21, 1867 – March 29, 1934) was a German-born American investment banker, collector, philanthropist, and patron of the arts. He was born in Mannheim, Germany, the son of a rabbi, and emigrated to the United States in 1881. Kahn began his career in banking in 1883, working for the banking firm of Speyer & Co. in New York City. He rose quickly through the ranks and became a partner in the firm in 1890. In 1909, he and several other partners left Speyer & Co. to form the investment banking firm of Kuhn, Loeb & Co., where he served as a senior partner until his death. Kahn was a major philanthropist, donating large sums of money to a variety of causes. He was a major patron of the arts, donating to the Metropolitan Museum of Art, the New York Philharmonic, and the New York Public Library, among other institutions. He was also a major donor to educational institutions, including Columbia University, Harvard University, and the Jewish Theological Seminary of America. Kahn was also a collector of art and antiquities, and his collection was one of the largest and most important of its time. He was a member of the Metropolitan Museum of Art's board of trustees from 1910 until his death in 1934. Kahn was married twice, first to Adelaide Wolff in 1891 and then to Addie Wolff Kahn in 1921. He had four children.
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