In 2009, the Association of Pediatric Program Directors (APPD) Longitudinal Educational Assessment Research Network (LEARN), a national educational research network, was formed. We report on evaluation of the network after 10 years of operation by reviewing program context, input, processes, and products to measure its progress in performing educational research that advances training of future pediatricians. Historical changes in medical education shaped the initial development of the network. APPD LEARN now includes 74% (148 of 201) of US Pediatric residency programs and has recently incorporated a network of Pediatric subspecialty fellowship programs. At the time of this evaluation, APPD LEARN had approved 19 member-initiated studies and 14 interorganizational studies, resulting in 23 peer-reviewed publications, numerous presentations, and 7 archived sharable data sets. Most publications focused on how and when interventions work rather than whether they work, had high scores for reporting rigor, and included organizational and objective performance outcomes. Member program representatives had positive perceptions of APPD LEARN's success, with most highly valuing participation in research that impacts training, access to expertise, and the ability to make authorship contributions for presentations and publication. Areas for development and improvement identified in the evaluation include adopting a formal research prioritization process, infrastructure changes to support educational research that includes patient data, and expanding educational outreach within and outside the network. APPD LEARN and similar networks contribute to high-rigor research in pediatric education that can lead to improvements in training and thereby the health care of children.