MARBURG, MARBURG SCHOOL OF. — This is one of the two main directions of German Neo-Kantianism; its founder was Hermann Cohen (q.v.; 1842–1918), and its principal continuators were Paul Natorp (q.v.; 1854–1924) and Ernst Cassirer (1874–1945).
Unlike the Southwest Neo-Kantianism of Freiburg and Heidelberg, which devoted itself to the “philosophy of values,” the Marburg School sought instead to clarify the foundations of the mathematical and natural sciences through the theory of productive thought, elevating logic to the status of a fundamental discipline. In its early phase, the philosophy of N. Hartmann (1882–1950) was also connected with the Marburg School; later, however, Hartmann turned to phenomenology in order to construct a metaphysics and a theory of values that made substantial concessions to traditional realism (q.V. NEOCRITICISM).