In 1924, at 18, Arendt went to study philosophy at the University of Marburg, where Martin Heidegger was establishing his reputation as the most important continental philosopher of the twentieth century. Like many of Heidegger’s brilliant Jewish students (Herbert Marcuse was another), Arendt was mesmerized by his lectures. Heidegger, in turn, quickly recognized Arendt’s intellectual gifts and agreed to mentor her dissertation. He also became her secret lover, though he was more than twice her age and married with children. A decade later, Heidegger became a committed member of the Nazi Party and the head of the University of Freiburg, where he encouraged his students to give the Nazi salute and enthusiastically carried out the party’s directive to purge all Jews from the faculty.
http://frontpagemag.com/2012/01/16/hannah-arendt-and-the-origins-of-israelophobia/