Members of the Frankfurt School have had an enormous effect on Western thought, beginning soon after Max Horkheimer became the director of the Institute for Social Research at the University of Frankfurt am Main in 1930. Also known as the Horkheimer Circle, the group included such eminent intellectuals as Theodor Adorno, Herbert Marcuse, Erich Fromm, Leo Lowenthal, and Friedrich Pollock. Fleeing Nazi oppression, Horkheimer moved the Institute and many of its affiliated scholars to Columbia University in 1934, where it remained until 1950.