"Vivian Maier Developed" is the definitive biography of Vivian Maier, a nanny who secretly lived as a photographer. The book unveils her life story through nearly 400 images, many previously unseen, contextualizing them within her life. Maier became famous posthumously when her work was discovered in a Chicago storage locker. The biography explores her hidden past and her journey from a troubled family background to becoming an iconic photographer. The author had exclusive access to Maier's personal records and 140,000 photographs, revealing her resilience, advocacy for social justice, and profound creative talent.