He wrote and edited several books and published numerous articles on the art , architecture and historiography of the Middle Ages and the early Renaissance period .
He was the first Avalon Professor of the Humanities a New York University ( NYU ) .
Professor wrote and edited several books and published numerous articles on the art , architecture and historiography of the Middle Ages and the early Renaissance period .
He was the first Avalon Professor of the Humanities a New York University ( NYU ) .