David Rockefeller's private art collection recently became the most valuable single-owner private sale in American history, auctioning off over 1,500 pieces for a total of $832 million over four days. The collection included important works by artists like Henri Matisse, Claude Monet, Georgia O'Keeffe, and Pablo Picasso. Though Rockefeller initially had no interest in art, he and his wife Peggy began acquiring Impressionist and modern pieces in the 1940s after being educated by Museum of Modern Art directors. All proceeds from the auction will go to nonprofit organizations associated with Rockefeller, including the Museum of Modern Art, Harvard University, and Rockefeller University.