When Highmark Foundation launched a new initiative to increase schools’ capacities to mitigate instances of bullying, it started by building a coalition of leaders in bullying prevention. Together the Foundation and its coalition are responsible for the largest implementation of the Olewus Bullying Prevention Program in the United States. This Promising Practices in Maternal and Child Health fact sheet calls attention to the dynamics that ensured a successful partnership, such as building upon the established work of coalition members and supporting ongoing evaluation. The coalition also created a road map for other organizations to use to justify and implement new school-based bullying prevention programs.