In this article we illustrate the roles of school psychologists, administrators, social workers, teachers, and parents in school reform by describing the adoption, initial implementation, and formative evaluation of an evidence-based social and emotional learning (SEL) program within several rural Midwestern school districts in a geographically large county. As part of a countywide initiative aimed at improving children's mental health services, an interdisciplinary team collaborated to select and implement a universal school-based curriculum addressing SEL objectives. Professionals in the county's special education cooperative lead the reform effort, general education teachers deliver the curriculum, and school psychologists and school social workers have served as trainers and consultants to educators and building administrators. An ecological model of organizational consultation informs these efforts. We illustrate this model by describing its application to the collaborative school-based initiative addressing SEL objectives. We also discuss implications for future consultation research, training, and practice.