In November of 2007, the New York City Department of Education assigned elementary and middle schools a letter grade (A to F) under a new accountability system. Grades were based on numeric scores derived from student achievement and other school environmental factors such as attendance, and...

Mentoring has become an extremely popular policy for improving the retention and performance of new teachers, but we know little about its effects on teacher and student outcomes. I study the impact of mentoring in New York City, which adopted a nationally recognized mentoring program in 2004. I...