From 1966 to 2002 I taught courses and seminars in Medieval and Byzantine art and architecture and seminars on the Methodologies of Art History. From 1978-1987 I served as Chair of the program on Medieval Studies. In 2004I was elected Fellow of the Medieval Academy of America. My research and writings range from Early Christian architecture, Coptic Art, Carolingian and Early Irish art, 13th-c. chronicles, Gothic architecture to Apocalypse manuscripts from the 9th-14th c. My work has been supported by the Andrew W. Mellon Foundation, American Council of Learned Societies, National Endowment for the Humanities, Pew Foundation, and the Millard Meiss Publication Fund. I am still actively engaged in research and writing. Inspired by reception theory, the role of the viewer and the contextualization of the medieval and present viewer’s experience function as critical factors in my interpretation of meaning.