Alexandra Libby is senior administrator for collections and initiatives and a curator of northern baroque paintings at the National Gallery of Art in Washington, DC. Brooks Rich is associate curator of old master and nineteenth-century prints at the National Gallery of Art. Stacey Sell is associate curator of old master drawings at the National Gallery of Art and the coauthor of Drawing in Silver and Gold: Leonardo to Jasper Johns (Princeton). Brian W. Ogilvie is professor of history at the University of Massachusetts, Amherst.