Dr. Marner's fields of study include Medieval European art and architecture, museum studies, visual literacy, and colonialism and art.
Marner published his book on St. Cuthbert in 2000 and is presently working on a book on the scriptorium at Durham in the late-12th century. His other publications span medieval art while his most recent (2006) deal with the National Portrait Gallery in Kenya: "Joy Adamson, the Peoples of Kenya and the Desire for Eden" and museum publications from around the world: "Museum Publications: history, bibliography, iconography".
After having completed his PhD at the School of World Art Studies at the University of East Anglia, UK he went on to teaching positions at the University of Edinburgh and University College Dublin. He held postdoctoral fellowships at the University of East Anglia, Trinity College Dublin and the University of Cambridge.
He has received grants and fellowships from the Social Science and Humanities Research Council, the Getty Trust and the British academy.