After earning his PhD from Princeton in 1950, Rawls taught there until 1952 when he received a Fulbright Fellowship to Oxford University (Christ Church), where he was influenced by the liberal political theorist and Historian Isaiah Berlin and the legal theorist H. L. A. Hart. After returning to the United States he served first as an assistant and then associate professor at Cornell University. In 1962 he became a full professor of philosophy at Cornell, and soon achieved a tenured position at MIT. That same year he moved to Harvard University, where he taught for almost forty years and where he trained some of the leading contemporary figures in moral and political philosophy, including Thomas Nagel, Allan Gibbard, Onora O'Neill, Adrian Piper, Elizabeth S. Anderson, Christine Korsgaard, Susan Neiman, Claudia Card, Thomas Pogge, T.M. Scanlon, Barbara Herman, Joshua Cohen, Thomas E. Hill, Jr., Gurcharan Das, Andreas Teuber, Samuel Freeman and Paul Weithman.