Metropolitan Museum curators William M. Ivins and his protégé A. Hyatt Mayor not only assembled a vast collection of prints, from Renaissance masterworks to ephemeral works, but also expanded the appreciation of prints as tools of communication. Drawing on personal letters and departmental records, this comprehensive exploration of the lives, careers, theories, and influence of Ivins and Mayor is bolstered by 120 exceptional prints that represent the breadth and depth of their acquisitions, including works by Dürer, Rembrandt, Daumier, Goya, Whistler, Cassatt, Degas, Whistler, Toulouse-Lautrec, and Hopper.