Vivian Maier lived her public life as a Chicago nanny. While she wasn't caring for kids (the same ones for many years) she was quietly taking pictures of people on the street. REALLY quietly. Like, she wasn't telling anyone. Her work was only discovered by chance at an auction after her death. It's now considered one of the greatest collections of street photography of the 20th century. Finding Vivian Maier tries to unravel the mystery of the secret artist's life and work. It opens Friday in NY and LA, and elsewhere in April. For more, where and when, see the film's website.