He is particularly interested in questions to do with the origins and historical reliability of the gospels. He is involved in helping people to understand the first century context of Jesus and the early church, and to get students to be intelligently and responsibly excited about the New Testament (and equipped to teach it to others). He has written many publications including "The Parables of Jesus" (IVP), a guide to the teaching of Jesus and his most recent book "Paul and Jesus: the true story" (SPCK/Eerdmans) an introduction to Paul, looking at questions of history and theology in the book of Acts, Paul's letters and the gospels.