The broad aim of his work is the integration of medieval eastern Europe into the larger medieval European world. His first two books (Reimagining Europe: Kievan Rus’ in the Medieval World (2012) and Ties of Kinship: Genealogy and Dynastic Marriage in Kyivan Rus’ (2016) have focused specifically on the kingdom of Rus’, and its place in Europe. While forthcoming works look more broadly at rulership, titulature, and governance in medieval Europe, and medieval eastern Europe specifically.