Middle and high school math and science teachers provide the foundation for education in the growing science, technology, engineering, and mathematics fields. They are crucial to California's efforts to remain competitive in a global economy. This policy brief looks at the shortage and challenges involved in recruiting and retaining fully prepared math and science teachers. It also outlines actions policymakers and educators are taking to address the issue. (Contains 2 figures.) [Funding for this brief was provided by The Noyce Foundation.]