 Strauss spent 1922 in Freiburg where he attended Edmund Husserl’s lectures on phenomenology. Like a number of others, who would soon become famous philosophers in their own right, such as Emmanuel Levinas, Hans-Georg Gadamer, Karl Löwith, and Hannah Arendt, Strauss was quickly taken with Husserl’s student, Martin Heidegger, who, he later wrote, impressed him as no other contemporary thinker had. The following year Strauss began lecturing in Frankfurt under the auspices of a center for adult education, the Freies Jüdische Lehrhaus, founded by Franz Rosenzweig (1886–1929). In 1925, Julius Guttmann (1880–1950) invited Strauss to Berlin to edit the jubilee edition of Moses Mendelssohn’s work for the Academy of the Science of Judaism. In 1930, Strauss published his first book, Spinoza’s Critique of Religion, dedicated to Rosenzweig’s memory, in which he argued that nineteenth and twentieth-century readers of Spinoza could see him as a “God intoxicated man” only because they had ceased to take the possibility of divine revelation seriously.