2 for the ages: Chairman and Knight: Aidin Vaziri | British photographer Terry O’Neill has taken unforgettable pictures of pop culture icons like Audrey Hepburn, the Beatles and David Bowie. But what made him pick two of his more unconventional subjects for the upcoming San Francisco Art Exchange exhibiti, “Chairman of the Board, Knight of the Realm: Photographs of Frank Sinatra & Sir Elton John”? It’s easy. “They’re two of the hardest-working artists I’ve ever worked with,” says O’Neill, 70, calling from his home in London last week. “There will never be anyone like them again.” Read more.