Book excerpt: In the early 1990s 50,000 children were in New York City's foster care system. By 2011 there were fewer than 15,000. In his book, David Tobis shows how such radical change was driven largely by a movement of mothers whose children had been placed into foster care, who fought to become advocates and stakeholders in a system that had previously viewed them as part of the problem. This book serves as an example of how advocates can change a system, as told from the perspective of key figures, change agents, and the parent advocates themselves.