Research by The Bridgespan Group has found that field catalysts are an often overlooked lever for unlocking large-scale impact. These organizations go by a number of different names—including systems orchestrators, ecosystem builders, network weavers, and backbones—and they have made significant contributions to systems change around the globe. Developed by Student Experience Research Network in conjunction with Bridgespan, this set of materials includes a short overview of what field catalysts do as well as case studies of four field catalyst organizations.