David Hockney, born 9 July 1937, is an English painter, draftsman, printmaker, stage designer, and photographer. As an important contributor to the pop art movement of the 1960s, he is considered one of the most influential British artists of the 20th century. Hockney has owned a home and studio in Bridlington and London, and two residences in California, where he has lived on and off since 1964: one in the Hollywood Hills, one in Malibu, and an office and archives on Santa Monica Boulevard in West Hollywood, California. On 15 November 2018, Hockney's 1972 work Portrait of an Artist (Pool with Two Figures) sold at Christie's auction house in New York City for $90 million (£70 million), becoming the most expensive work by a living artist sold at auction. This broke the previous record, set by the 2013 sale of Jeff Koons' Balloon Dog (Orange) for $58.4 million.