This article makes a case for state boards of education to work with schools of education to ensure all teachers--even brand-new ones--are prepared to serve diverse learners effectively, including students with disabilities. This goal is within reach thanks to performance measures for new educators such as the "Performance Assessment for California Teachers," "Connecticut's BEST" program, and the soon-to-be-nationally available "Teacher Performance Assessment" (TPA), which now includes 26 participating states. Robinson highlights the potential of the TPA to help ensure teachers can achieve positive results with all learners, and that the success of the TPA depends on the collaboration of state boards of education and educator preparation programs to ensure the new assessment and related policies are aligned to support the mutual goal of effective practice. Why? Because every learner in every classroom, including students with disabilities, has the right to a teacher who has validated his or her ability to help all students learn.