With the discovery of her archive in a thrift auction house in 2007, Vivian Maier’s posthumous trajectory from relative obscurity to one of the great American photographers of the 20th century is a story of a singular consistent talent.From the mid 1950s throughout her adult life she worked as a nanny between New York and Chicago, and it was during this time that she created a huge body of photographs and films recording every day street life, often including her own self portrait and moments of fleeting reflection within the cityscape.With her work compared to Helen Levitt, Robert Frank and Diane Arbus, her photographs are a fascinating window into American life.