Vivian Maier was a street photographer in a day when people smoked cigarettes and slept in their cars.
But what's more interesting is no one knew this until after her death in 2009 when buckets of her negatives were discovered at an estate sale.
A nanny in Chicago during the 40's-60's, Maier will certainly go down in history as one of the most highly regarded street photographers of her, or any other, era.