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Moritz Geiger (Frankfurt, 26 June 1880 – Seal Harbor, Maine, 9 September 1937) was a German philosopher and a disciple of Edmund Husserl. Beside phenomenology, he dedicated himself to psychology, epistemology and aesthetics.
Moritz Geiger studied law at Munich in 1898, then history of literature in 1899, and finally philosophy and psychology in 1900, with Theodor Lipps. During the years 1901-1902, he studied experimental psychology with Wilhelm Wundt at Leipzig. Returning to Munich in 1904, he became part of the circle of students around Lipps, which included Alexander Pfänder, Adolf Reinach, Theodor Conrad, Aloys Fischer, Max Scheler, and Dietrich von Hildebrand. In 1906, Geiger attended Husserl's lessons in Göttingen, and became part of the Munich Circle of phenomenology, along with Reinach, Conrad, Fischer and Pfänder. He passed his thesis in 1907. Along with this Husserlian circle (including Max Scheler), he published the review Jahrbuch für Philosophie und phänomenologische Forschung.
In 1915, he became a teacher at Munich and, after World War I, at Göttingen (1923). With the advent of Nazism, he exiled himself in 1933 to the United States, teaching at Vassar College in New York and at Stanford University.