Schlick, Moritz (mōˈrĭts shlĭk) [key], 1882–1936, German philosopher, b. Berlin, grad. Univ. of Berlin (1904). He taught at Rostock and Kiel before he became (1922) professor of the philosophy of inductive sciences at the Univ. of Vienna; there he was the leader of the Vienna Circle, a group of logical positivists (see logical positivism). Influenced by Ludwig Wittgenstein and Rudolf Carnap. Schlick emphasized experience as the means of establishing the truth of claims to knowledge. His works include General Theory of Knowledge (2d ed. 1925) and Problems of Ethics (tr. 1939).