Numerous studies have highlighted the importance of effective teachers for student achievement. But new research suggests that school counselors may be just as critical as teaching staff for some students. In a paper in the American Economic Review, author Christine Mulhern found that effective high school counselors can significantly improve the chance that students graduate from high school and attend a four-year college. She says that although it is challenging to predict which counselors will have these large positive impacts, the effects are comparable to many popular education interventions. Mulhern recently spoke with Tyler Smith about the role that counselors play in students' choices, which students benefit the most from counseling, and the lessons administrators and parents can take away from her findings.