He specializes in Italian Renaissance art, with an emphasis on painting and graphic media of late-fifteenth and sixteenth-century Tuscany. His publications include Piero di Cosimo: Visions Beautiful and Strange (2006), as well as articles and reviews appearing in the Burlington Magazine, Art Bulletin, Renaissance Quarterly, and Mitteilungen des Kunsthistorischen Institutes in Florenz. His work has been supported by the Metropolitan Museum of Art, the American Council of Learned Societies, the Renaissance Society of America, and the Dutch Institute for Art History in Florence. His current research is engaged with subjects ranging from Renaissance landscape to modes of artistic exchange between Italy and Spain. At the Clark, Geronimus will pursue his book project on the Florentine painter Jacopo da Pontormo.