Philo was the first Jewish philosopher who left behind one of the richest bodies of work from antiquity, yet his personality and intellectual development have remained a riddle. Maren Niehoff presents the first biography of Philo, arguing that his trip to Rome in 38 CE was a turning point in his life. He was exposed then not only to new political circumstances but also to a new cultural and philosophical environment. The Intellectual Biography traces Philo's trajectory from his early days as a Bible interpreter in the Jewish community of Alexandria to his diplomatic and intellectual activity in Rome, when he engaged Roman philosophy. Anticipating Sa'ada Gaon and Maimonides by almost a thousand years, Philo creatively presents Jewish philosophy in the context of contemporary culture and thought.