Jean Astruc (1684–1766), a French physician, believed these critics were wrong about Mosaic authorship. According to Old Testament scholar Edward Young (1907–1968), Astruc believed that Moses the first book of the Pentateuch, the book of Genesis, using the hereditary accounts of the Hebrew people. Biblical criticism is often said to have begun when Astruc borrowed methods of textual criticism (used to investigate Greek and Roman texts) and applied them to the Bible in search of those original accounts. Astruc believed that, through this approach, he had identified the separate sources that were edited together into the book of Genesis. The existence of separate sources explained the inconsistent style and vocabulary of Genesis, discrepancies in the narrative, differing accounts and chronological difficulties, while still allowing for Mosaic authorship. Astruc's work was the genesis of biblical criticism, and because it has become the template for all who followed, he is often called the "Father of Biblical criticism".