In 2007, a Chicago man named John Maloof bought a box of photo negatives at an auction house for a couple of hundred dollars. The box turned out to be a cache of incredible street photographs from an artist no one had ever heard of, Vivian Maier. Since then, Maloof has gone on to be her champion: printing and archiving thousands of her photos, creating two books on her work, and holding shows around the world. Now Maloof has made a movie, along with co-director Charlie Siskel, about his journey to find out more about this mysterious and wildly talented woman. It’s called Finding Vivian Maier.