The AAAS Science & Technology Policy Fellowships are opportunities for professional development and public service. They are operated by AAAS as part of its mandate to “advance science and serve society.” The aim is to foster scientifically informed, evidence-based policy and practice by involving scientists and engineers from a broad range of disciplines, backgrounds and career stages to engage their knowledge and analytical skills while learning first-hand about policymaking and implementation at the federal level; and to build leadership for a strong science and technology enterprise that benefits all people. This is accomplished by developing the capacity of scientists and engineers to effectively inform individuals and institutions that influence and determine policies, regulations and funding.