How can Christians witness to the complexity of our world? Gregg Okesson shows that local congregations are the primary means of public witness in and for the world. As Christians move back and forth between their churches and their neighborhoods, workplaces, and other public spaces, they weave a thick gospel witness. This introduction to public missiology explains how local congregations can thicken their witness in the public realms where they live, work, and play. Real-life examples from around the world help readers envision approaches to public witness and social change.