David Hockney is considered one of the most influential British artists of the 20th century. He has produced work in almost every medium - painting, drawing, stage design, photography and printmaking - and has stretched the boundaries of all of them. Born in Bradford, England, in 1937, Hockney attended art school in London before moving to Los Angeles in the 1960s. There, he painted his famous swimming pool paintings. In a 2011 poll of more than 1,000 British artists, Hockney was voted the most influential British artist of all time. He continues to create and exhibit art. Martin Gayford is art critic for The Spectator and the author of acclaimed books on Van Gogh, Constable and Michelangelo. He is the author of Man with a Blue Scarf, Rendez-vous with Art and A Bigger Message. He has collaborated with David Hockney on A Bigger Message: Conversations with David Hockney and A History of Pictures, and has co-written a volume of travels and conversations with Philippe de Montebello: Rendez-vous with Art.