His research interests include the recruitment, preparation, and retention of teachers for culturally diverse contexts and urban schools, as well as multicultural citizenship and democratic education. Prior to serving as an assistant professor, Castro taught in urban schools and worked in a variety of outreach and educational programs for low-income and minority populations. He currently teaches undergraduate and graduate courses in diversity and social studies education at MU. He also serves in a leadership role on the College of Education Diversity Committee and conducts workshops for teachers about diversity in local area schools.