Robert E. Jackson, collector, and Sarah Greenough, senior curator of photographs, National Gallery of Art. Robert E. Jackson has been collecting other people's snapshots for more than a decade. Some of the best works in his collection are on display in The Art of the American Snapshot, 1888-1978. In this podcast Jackson and Sarah Greenough, senior curator of photographs, talk about why he collects snapshots and what makes an image capture his attention.