During a time when teacher turnover is high, retention is low, and some positions go unfilled for years at a time, the conditions have never been more favorable to redesign the fundamental way we staff our nation's schools. Brent W. Maddin and Randy L. Mahlerwein describe how Arizona's Mesa Public Schools and Arizona State University are working together to empower educators to design and implement innovative, team-based staffing models that make the job of being a teacher less isolating, more flexible, and, ultimately, more sustainable.