I study medieval Britain, Ireland and Brittany, with interests ranging from the sixth century to the twelfth. My research focuses on maritime connections and now-lost kingdoms. Particular areas of interest are the Irish Sea region in the Viking Age; central Britain (northern England and southern Scotland) prior to the Anglo-Scottish border; and connections between northern Britain and Wales.  My monograph Gaelic Influence in the Northumbrian Kingdom: The Golden Age and the Viking Age won the Frank Watson Book Prize, 2021. I have been involved in funded projects on Furness Abbey’s links across the Irish Sea and contacts between Britain and Brittany. I am interested in interdisciplinary work, for example combining historical and linguistic evidence through the study of names. From 2016-24 I was the Director of the Regional Heritage Centre, which received an Educate North Award for Community Engagement in 2023. I am committed to Equality, Diversity and Inclusion in Higher Education, including the department's Athena Swan Bronze award (2021).