There is growing interest among researchers, policy makers, and practitioners in identifying teachers who are skilled at improving student outcomes beyond test scores. However, questions remain about the validity of these teacher effect estimates. Leveraging the random assignment of teachers to classes, I find that teachers have causal effects on…

Despite the fact that the early reading proficiency for all children has become a national mandate captured in both the No Child Left Behind (NCLB) Act and the Individuals with Disabilities Education Act (IDEA), the poor performance of America's fourth graders on national examinations of reading proficiency indicates that the nation is far from…