In fall 2020, the U.S. Department of Education awarded the National Institute for Excellence in Teaching (NIET) a $2.5 million grant, in partnership with the University of South Carolina (UofSC) and the Branch Alliance for Educator Diversity (BranchED). The aim of the three-year Supporting Effective Educator Development (SEED) grant is to build and accelerate the leadership capacity of 150 South Carolina principals and school leaders in supporting science, technology, engineering, and math education (STEM) and social-emotional learning for students. This report describes what NIET is doing to achieve the following three primary goals: (1) Create new, sustainable Principal Leadership Networks for 150 school leaders serving in underserved communities over the duration of the grant; (2) Build instructional leadership capacity of school leaders serving in underserved communities through quarterly virtual training and personalized on-site coaching to support effective leadership; and (3) Build the knowledge of school leaders serving in underserved communities in leading and strengthening rigorous programs to improve student outcomes.