Stephen Collier studies city planning and urban governance from the broad perspective of the critical social science of expertise and expert systems. His work addresses a range of topics, including climate resilience and adaptation, emergency preparedness and emergency management, neoliberal reform, infrastructure, and urban social welfare. Collier examines both contemporary and historical topics, and is engaged with a number of sub-disciplinary fields, including science and technology studies, actor-network theory, governmentality studies, and cultural geography.