Colin Gleadell fills in the blanks a bit more on collector Pauline Karpidas who has been identified–first by Lindsay Pollock–as the seller of the Warhol, 200 One Dollar Bills. The Manchester-born Karpidas will receive $39 million from the sale:

Apart from bringing a lift to the market, the price may prove beneficial for young artists and educational establishments. Karpidas, who was introduced to the art world in the Seventies by Athens art dealer Alexander Iolas has long been known as a patron of young artists whose work she displays at her workshop gallery on Hydra. She is a benefactor of Tate and the Sir John Soane Museum in London, and an education centre at New York’s New Museum is named after her and her late husband, Constantine.

Art Market News (Telegraph)