The U.S. elementary and secondary teaching force in recent decades has changed significantly and in important, sometimes surprising ways. It has become far larger, far less experienced, less diverse by gender, and more diverse by race/ethnicity. And it remains unstable. Yet researchers, policymakers, and the public appear not to have much marked these trends, even the most dramatic ones. I will summarize five of the key trends we identified, along with some takeaways and questions for state boards of education and others involved in state education policymaking to consider.