State education leaders and entities play vital, if not always highly visible, roles in establishing high-quality professional learning. Through legislation and regulations, resource allocation, leadership support, and more, they establish a vision of professional learning and support its implementation in districts and schools. In particular, state education agencies have the reach and leverage to foster a comprehensive, sustained system of professional learning for all educators. But creating that coherence is a complex undertaking. The Delaware Department of Education navigates this complexity by grounding their work in Standards for Professional Learning. The standards have helped them understand how to implement meaningful learning processes and foster the conditions necessary for learning to thrive. Most recently, the standards have supported shifting the state's definition of high-quality professional learning to be content-specific and curriculum-focused. As the work evolves to reflect changes in the field, the evolution of the standards is instrumental in developing the knowledge and credibility to change policies and practices so that every educator can help every student succeed.