Observer Arts Interviews Mary Rozell of the UBS Art Collection observer.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from observer.com Daily Mail and Mail on Sunday newspapers.
Drawn from a 300-work sub-collection gathered by John Szarkowski in the 1990s, the gift includes images by 96 photographers among them Dorothea Lange, Alfred Stieglitz and Edward Weston