This is an overview of the work of criminologists that informs how people build trust, safe and social security in the face of violent social differences. The article begins with a story of how the term “peacemaking” came to “criminology.” A theory of peacemaking emerging from this beginning is then stated, including a review of criminological literature that informs the theory. The theory is grounded in a paradigmatic departure from criminology’s tradition—the study of crime and criminality—to proposing instead of studying what replaces human separation with cooperation and mutual trust. This paradigm implies that stories of dispute handling are its most authoritative data, especially stories people tell about their own relations. It also implies new ways of evaluating the fruits of adopting a peacemaking paradigm for learning and living.