In 1947, Havelock moved to Cambridge, Massachusetts, to take a position at Harvard University, where he remained until 1963. He was active in a number of aspects of the University and of the department, of which he became chair; he undertook a translation of and commentary on Aeschylus' "Prometheus Bound" for the benefit of his students. He published this translation, with an extended commentary on Prometheus and the myth's implications for history, under the title "The Crucifixion of Intellectual Man" (and then changed it back to "Prometheus" when the book was republished in the 1960s, saying that the earlier title had "come to seem a bit pretentious"). During this time he began his first major attempt to argue for a division between Platonic or Aristotelian philosophy and what came before. His focus was on political philosophy and, in particular, the beginnings of Greek liberalism as introduced by Democritus. In his book "The Liberal Temper in Greek Politics", he argued that for Democritus and the liberals, political theory was based on an understanding of "the behaviour of man in a cosmic and historical setting": that is, humanity defined as the poets would define it—measured through its individual actions. Plato and Aristotle were interested in the nature of humanity and, in particular, the idea that human actions might be rooted in inherent qualities rather than consisting of individual choices.