Earlier works in the collection include early American limner painters, while the most recent works are from 20th century modernists, including Charles Demuth, Yasuo Kuniyoshi and Stuart Davis. Among the holdings in the American collection are various 19th-century Romantic landscape paintings from the 19th century, Ash Can School works, and portraits, include Gilbert Stuart's Mrs Stephen Peabody (1809). The museum holds Georgia O'Keeffe's Horse's Skull on Blue (1930), a depiction of a sun-bleached skull that is the first in a series of skull paintings created by O'Keeffe after bones found in the desert around her ranch.