Critic and Director of Undergraduate Studies in Art at Yale University
Curator for Early Books and Manuscripts at the Beinecke Rare Book & Manuscript Library at Yale University
Head of Exhibitions and Publications, and Assistant Curator of 17th-Century Paintings, Yale Center for British Art
Professor in the History of Art and Director of Undergraduate Studies, Medieval European Art and Architecture.
Director of Publications and Editorial Services
Yale University Art Gallery
Founder and Co-Editor-in-Chief