Specialist in Renaissance art, both Italian and northern European, on which she has published widely, notably From Flanders to Florence: the Impact of Netherlandish Painting 1400-1500 (Yale, 2004). Has collaborated on major exhibitions including Jan van Eyck: an Optical Revolution (Ghent, 2020). Former Director of the V&A Medieval and Renaissance Year course, and lecturer at – among others – the Courtauld Institute and the British Institute of Florence.