This report highlights findings from a recently completed evaluation of the National Science Foundation (NSF) Graduate STEM Fellows in K-12 Education Program (GK-12). The report describes GK-12 participants, examines the activities in which GK-12 Fellows and teachers engage, compares Fellows’ activities to those of non- GK-12 students, and presents the perceived outcomes of the GK-12 experience for Fellows, K-12 teachers, and institutions of higher education.