Vivian Maier, a French-born governess, was born in New York in 1929. She stayed there until 1956, when she left for Chicago. It was during her walks with the children she looked after and in her free time that she photographed her surroundings. Her photographs reflect the rising American dream in a world where modernity is gradually taking over. Her deeply sensitive and humanistic photography portrays the American society of the 1950's in full social and political mutation. They are street scenes, portraits, self-portraits of all kinds, gestures, details on the sidewalks... Vivian Maier's pictures and talent were discovered posthumously, which does not prevent her from being one of the greatest photographers of the 20th century. Her name resides alongside such historic photographers as Robert Frank, Diane Arbus, Robert Doisneau and Henri Cartier-Bresson. For this unprecedented exhibition, unpublished archives discovered in 2007 are unveiled to the public. Vintage photographs she took, super 8 films and audio recordings retrace the entirety of the mystery woman's dense career, from the 1950s to the late 1980s.