At a national level, the supply of teachers has remained stable in recent years--however, at the state and local level, school districts have been wrestling with long-standing teacher shortages in a number of specific fields, including science, technology, engineering, and math (STEM) subjects; career and technical education (CTE); bilingual education; and special education. Schools and students in low-income and minority neighborhoods often face particularly significant challenges in terms of recruiting and retaining teachers in hard-to-staff subjects. The report looks at the challenge of teacher shortages facing public schools across the U.S., and the role that internationally educated and trained immigrant and refugee professionals can play in addressing these shortages. The discussion focuses in particular on "alternative teacher certification" initiatives that seek to attract a diverse group of career changers and subject matter experts into the classroom--immigrant professionals among them. The report also offers policy recommendations at the local, state, and federal levels that would help advance such efforts, and support the development of a skilled and diverse teacher workforce that meets the needs of increasingly diverse schools.