The idea of student-centered learning is not new; teachers have long sought to design personalized, competency-based environments that are tailored to individuals and that empower students to drive their own learning. What is new is the emergence of an online learning ecosystem and, with it, the technical possibility of equipping all students with a student-centered model. Add to this mix COVID-19, which has provoked unprecedented demand for reinventing what teachers do, and it's the perfect combination of catalysts for a rapid conversion to student-centered schooling. But a barrier remains. Most K-12 educators today don't have the skill sets necessary to run student-centered schools. This report helps dismantle that barrier by identifying specific student-centered competencies for educators in the field that can be stacked to create customized student-centered teaching micro-credentials. The first part of this report uses the Theory of Interdependence and Modularity as a framework for analyzing solutions for student-centered professional development (PD). The second part proposes 66 educator micro-credentials for student-centered teaching. The third part profiles 14 leaders who are at the vanguard of student-centered teaching and shares their personal lists of the most important educator competencies for specific roles. The fourth part offers recommendations for how to move the micro-credentialing ecosystem forward. Much work remains, but micro-credentials for student-centered teaching could be the key to unlocking a personalized, competency-based education for all learners in all schools. [This report was funded by the Charles Koch Foundation.]