Paul Bolton's main areas of expertise are program design, implementation, monitoring and evaluation. His work treats all four elements as part of an integrated whole in which applied research methods play a core role. He uses this approach to conduct needs assessments and to plan and evaluate programs with service providers including major NGOs. This work has encompassed programs dealing with physical health (including infectious diseases) and more recently psychosocial problems in North America, Latin America, sub-Saharan Africa, Central and Southeast Asia, Eastern Europe, and the Caribbean. Much of this work has been with refugees and internally displaced persons during the disaster post-emergency phase, persons affected by violence, and other adults and children living in difficult circumstances. Dr. Bolton has also conducted program evaluations of psychosocial interventions in Africa and Asia in the form of randomized clinical trials.