In the last few weeks, two major reports on teacher turnover and retention have been released. One was rolled out with extensive media coverage, and has been the subject of much discussion among policymakers and education commentators. The other was written by me, along with Teachers College doctoral student Clare Buckley, says Aaron Pallas [1], professor of sociology and education at Teachers College, Columbia University, for the Washington Post. The first report, “The Irreplaceables: Understanding the Real Retention Crisis in America’s Urban Schools [2],” was prepared by TNTP, an organization formerly known as The New Teacher Project that prepares and provides support for teachers in urban districts, and that advocates for changes in teacher policy. The second, “Thoughts of Leaving: An Exploration of Why New York City Middle School Teachers Consider Leaving Their Classrooms [3],” was released by the Research Alliance for New York City Schools (RANYCS), a nonprofit research group based at New York University. (RANYCS published a report by Will Marinell [4] in February 2011 that examined detailed patterns of teacher turnover in New York City middle schools apparent through the district’s human-resources office.)…