On the death of banker Robert Lehman in 1969, his Foundation donated 2,600 works of art to the museum. Housed in the "Robert Lehman Wing," the museum refers to the collection as "one of the most extraordinary private art collections ever assembled in the United States". To emphasize the personal nature of the Robert Lehman Collection, the Met housed the collection in a special set of galleries which evoked the interior of Lehman's richly decorated townhouse; this intentional separation of the Collection as a "museum within the museum" met with mixed criticism and approval at the time, though the acquisition of the collection was seen as a coup for the Met. Unlike other departments at the Met, the Robert Lehman collection does not concentrate on a specific style or period of art; rather, it reflects Lehman's personal interests. Lehman the collector concentrated heavily on paintings of the Italian Renaissance, particularly the Sienese school. Paintings in the collection include masterpieces by Botticelli and Domenico Veneziano, as well as works by a significant number of Spanish painters, El Greco and Goya among them. Lehman's collection of drawings by the Old Masters, featuring works by Rembrandt and Dürer, is particularly valuable for its breadth and quality. Princeton University Press has documented the massive collection in a multi-volume book series published as "The Robert Lehman Collection Catalogues".