F. C. Grant’s Multiple Source Theory was postulated by Frederick Charles Grant (1891–1974), a professor of Biblical Theology at the Union Theological Seminary in New York. He published titles such as The Gospels: Their Origin and Their Growth, The Age of Syncretism and The Earliest Gospel. In his book The Gospels: Their Origin and Their Growth (1957), Grant posited that the synoptic problem could be solved by looking into historical context and oral tradition, as well as in defining the centrality and the priority of Mark.