- “The First Crusade: The Call from the East 1095-1097” (2013)
- “The Crusade of the Poor 1100-1101” (2013)
- “The Peace of God” (2013)
- “The Siege of Jerusalem” (2015)
- “On the Laws and Customs of the Kingdom of Jerusalem” (2016)
- “How The Church Built Western Civilization” (2016)
- “The Decline of the Roman Empire: The Failure of a Superpower” (2017)
- “The Early Middle Ages: Europe from 400 to 1000AD” (2018)
- “428AD: An Ordinary Year at the End of the Roman Empire” (2020)
- “The Fall of Rome” (2021)
Journal Articles:
- "The First Crusade: A Call from the East" (Journal of Medieval History, 2013)
- "The Crusade of the Poor: A Social and Religious Movement" (English Historical Review, 2013)
- "The Peace of God: A Movement for Social Reform" (History, 2013)
- "The Siege of Jerusalem: A Turning Point in the Crusades" (Journal of Military History, 2015)
- "On the Laws and Customs of the Kingdom of Jerusalem: A Medieval Code of Law" (Speculum, 2016)
- "How the Church Built Western Civilization" (First Things, 2016)
- "The Decline of the Roman Empire: The Failure of a Superpower" (Claremont Review of Books, 2017)
- "The Early Middle Ages: Europe from 400 to 1000AD" (History Today, 2018)
- "428AD: An Ordinary Year at the End of the Roman Empire" (BBC History Magazine, 2020)
- "The Fall of Rome" (The Wall Street Journal, 2021)