Effective teachers can be one of the most powerful drivers of student success. Yet, across the country, districts and schools often struggle to identify, retain and develop them.

In a new working paper, American University researcher Seth Gershenson examines years of research into teacher effectiveness, identifying common challenges and promising approaches to teacher evaluation, pre-service training and in-service professional development.

Gershenson, author of the new book "Teacher Diversity and Student Success," joins CPRE Knowledge Hub managing editor Keith Heumiller to discuss the paper, and its implications for educational equity, student achievement and the nation's teaching workforce.