OK, this is amazing and totally worth your time:

Man Buys 10.000 Undeveloped Negatives At a Local Auction and Discovers One of The Most Important Street Photographers of the Mid 20th Century

Imagine this : perhaps the most important street photographer of the twentieth century was a nanny who kept everything to herself. Nobody had ever seen her work and she was a complete unknown until the time of her death. For decades Vivian’s work hid in the shadows until decades later (in 2007), historical hobbyist John Maloof bought a box full of never developed negatives at a local auction for $380.

Finding Vivian Maier - Official Movie Trailer