Engineering is a small but growing part of Kâ€"12 education. Curricula that use the principles and practices of engineering are providing opportunities for elementary, middle, and high school students to design solutions to problems of immediate practical and societal importance. Professional development programs are showing teachers how to use engineering to engage students, to improve their learning of science, technology, engineering, and mathematics (STEM), and to spark their interest in engineering careers. However, many of the policies and practices that shape Kâ€"12 engineering education have not been fully or, in some cases, even marginally informed by the knowledge of teacher leaders. To address the lack of teacher leadership in engineering education policymaking and how it might be mitigated as engineering education becomes more widespread in Kâ€"12 education in the United States, the National Academies of Sciences, Engineering, and Medicine held a convocation on September 30â€"October 1, 2016. Participants explored how strategic connections both within and outside classrooms and schools might catalyze new avenues of teacher preparation and professional development, integrated curriculum development, and more comprehensive assessment of knowledge, skills, and attitudes about engineering in the Kâ€"12 curriculum. This publication summarizes the presentations and discussions from the event.