Recent sources and research on the Council of Ephesus. Presented at the ETS Annual Meeting, 2021.
Friendship, fellowship and church politics in the Athanasian controversy. ETS Patristics Study Group, 2004.
Church and state from Constantine onward. Martin Luther College symposium, 1999.
The authenticity of Jerome's Letter 19. Expanded from the International Patristics Conference, Oxford, 1999.
What the early church taught and practiced about abortion and infanticide. Lutherans for Life presentation, 1994.
A debated 4th-century inscription and Pope Liberius. Presented at the North American Patristics Society, 2016.
Christian Rome in the 4th century through its buildings and art. Presented at the ETS Annual Meeting, 2010.
How the early church practiced fellowship. ETS (1998), WELS Pastors Conference (2002), revised 2012.
How the early church trained its pastors. Published in Wisconsin Lutheran Quarterly (1997).
