"After being stunned by the quality of the street photographs, Maloof began digging and discovered that they were created by a nanny and street photographer named Vivian Maier. Now some are saying he might have discovered one of the greatest (and previously unknown) street photographers of the 20th century." - Simon

She died in 2009 and her work only reached critical acclaim after her death. Some examples of her work here: http://vivianmaierphotography.com/ Her street photography is pretty breathtaking. - Simon