Across the education field, there is unusual consensus that strong teacher leaders are key to improving our nation's schools. Unfortunately, clear expectations for what teacher leaders should do, and strategies to prepare them to do it, are few and far between. One recent survey found that while 86 percent of schools have teacher leader roles, just 32 percent offered specialized leadership training for teachers stepping into those roles. New Leaders' Emerging Leaders Program (ELP) is a job-embedded teacher leadership development program that has trained over 1,000 participants in 13 high-need school districts since it was launched in 2011. ELP works with schools to strategically empower their best teachers to lead colleagues toward similar success. It helps principals carefully select candidates with the right foundational skills to deliver on that promise, then it helps participants master a focused set of high-impact instructional and adult leadership skills through targeted, on-the-job practice, expert coaching, and actionable feedback. Early insights after two years of data collection include: (1) Teacher leaders can immediately boost student learning in their schools; (2) Teacher leaders can quickly develop and apply critical leadership skills; and (3) Teacher leaders can fill gaps in the leadership pipeline. This report describes ELP and summarizes these findings. The report offers several recommendations for principals, policymakers, and district and charter leaders based on ELP's experience. [For the full report, "Untapped: Transforming Teacher Leadership to Help Students Succeed," see ED584852.]