A keen student of theology, August Friedrich Gfr rer (1803-61) became professor of history at the University of Freiburg and also sat as a representative in the Frankfurt parliament, agitating for the reunification of Protestantism and Catholicism. His academic work marked the modern period in the Christian study of Judaism, making full use of primary sources without pursuing an obvious apologetic or polemical agenda. This two-volume work, published in 1831, is a critical study of early Christianity and the influence that Judaism had on the New Testament. Volume 1 provides a thorough exposition of Philo of Alexandria's philosophy and theology. Gfr rer also offers a biographical sketch of Philo and gives an informative overview of his writings and his time.