Annie Leibovitz is a renowned 64-year-old American photographer who photographed John Lennon on the day he was assassinated and is the only woman to have held an exhibition at London’s National Portrait Gallery. Commercial photographers take photos of buildings, models, merchandise, artifacts and landscapes for promotional purposes. Advertising photographers use a variety of photos to sell products, lifestyles, concepts and ideas. Bob Martin is a multi-award winning sports photographer who shoots action and editorial pictures for advertising and corporate clients and has worked for The New York Times and Sunday Times.