John Marciari is the Charles W. Engelhard Curator and Head of the Department of Drawings and Prints at the Morgan Library and Museum, New York. Carmen Albendea and Ian McClure are conservators at the Yale University Art Gallery. Anikó Bezur is director of scientific research at Yale University's Institute for the Preservation of Cultural Heritage. Jens Stenger is associate conservation scientist at Yale University's Institute for the Preservation of Cultural Heritage. Benito Navarrete Prieto is a professor of the history of art at the University of Alcalá and the director of cultural infrastructure and heritage for Seville City Council.