​Humans are exceptional in their ability to cooperate with others. Yet, this hyper-sociality also makes conflict between groups exceptionally devastating. I examine the link between different constituents of human sociality (e.g., morality, altruism, common values, shared experiences) and intergroup violence (including religious extremism). To this end, I collaborate with researchers across the world (e.g., Lebanon, Palestinian Territories, Morocco, Northern Ireland) to study populations with direct exposure to violent conflict, such as active combatants. My work draws on a variety of methods, ranging from focus groups to large scale surveys and psychological experiments with children and adults.