His research interests lie primarily in the areas of the historical Jesus, Jewish-Christian relations in the first century CE, the transmission history of the New Testament, and the early church fathers, especially Irenaeus.
Here is a list of some of his written works:
- `The Message of Acts` (IVP, 1994)
- `Jesus and Judaism: The First Christians in their Jewish Context` (IVP, 2004)
- `The Historical Jesus: A Guide for the Perplexed` (Continuum, 2005)
- `Interpreting Jesus` (SPCK, 2010)
- `The Four Major Cults: An Overview of Mormonism, Jehovah's Witnesses, Seventh-day Adventism, and Christian Science` (SPCK, 2015)
- `The Oxford Handbook of the Historical Jesus` (Oxford University Press, 2018)
- `Jesus: His Life and Teaching: A Fresh Look at the Life of Jesus of Nazareth` (IVP, 2018)
- `The Reliability of the Gospels: Fact or Fiction?` (SPCK, 2020)