Top 200 Collectors and Arts Patrons Are Among the Consignors for This May’s New York Auctions

Art collectors and market-watchers start your engines. There’s only one week to go until the annual May marquee auctions in New York kick off next Monday with a Christie’s double-header:  a sale dedicated to works from the late Barnes & Noble founder and former ARTnews Top 200 collector Leonard Riggio and his wife Louise, followed by the house’s 20th century evening sale. As usual, the sales will be closely watched for signs of which way the market is blowing. Aft