This is the preface by Heidi Larson for the report “Overcoming barriers to vaccine acceptance in the community: Key learning from the experiences of 734 frontline health workers”. This report is presented today by The Geneva Learning Foundation (LinkedIn | YouTube | Podcast | Twitter) at the International Social and Behavior Change Communication Summit 2022 (#SBCCSummit) held 5-9 December 2022 in Marrakech, Morocco. What is the Geneva Learning Foundation? Get the full report… Read the preface by Heidi Larson… My own consciousness of the fragile equilibrium sustaining vaccine confidence came from working with immunization programmes and local health workers to defuse rumors that threatened to derail vaccination initiatives. Twenty years ago, this meant traveling to countries to meet, build relationships with, and work side-by-side with frontliners. Since that time, the corpus of research on the topic has grown tremendously. Elaborate behavioral science frameworks, supported by robust monitoring and evaluation, are now available to guide policy makers, donors, …