Hiring and retaining teachers of color is one approach that policymakers can use to support improved academic achievement and opportunities for racially and ethnically diverse students. National data show that while the student population is becoming more diverse, the teacher workforce remains largely white and female. While teachers from all races can inspire student success, research suggests that a more diverse teacher workforce could improve student academic, behavioral, social and emotional outcomes -- particularly for students of color. State policymakers are taking various approaches to building a diverse teacher workforce and ensuring all students reap the myriad benefits of teacher diversity in the classroom. This Policy Brief provides a summary of key research on the benefits of expanding the racial/ethnic diversity of teachers in K-12 classrooms. It also features examples of state-level action intended to advance diversity and ultimately improve students' academic experiences.