From the New York Times article:
The still unfolding legend of Vivian Maier has been one of photographic genius discovered only after a lifetime of shooting. Now hailed as a master of street photography, she spent most of her working life in obscurity as a nanny in New York, where she was born, and Chicago, where she died in 2009 at age 83.
Some of Vivian's amazing photos:
The doc trailer:
(Photos via the New York Times and Colossal)