John Ittmann is Curator of Prints, and Innis Howe Shoemaker is the Audrey and William H. Helfand Senior Curator of Prints, Drawings, and Photographs, both at the Philadelphia Museum of Art. James M. Wechsler is an independent scholar based in New York. Lyle W. Williams is Curator of Prints and Drawings at the McNay Art Museum, San Antonio.