I study collective-action problems in theory, lab, and field settings using quantitative and qualitative empirical methods. Collective-action problems are the heart of many environmental conflicts, and therefore environmental policy is an excellent research setting to study central theoretical issues. My research topics to date include collaborative policy, environmental activism, local government policy, and agricultural best management practices. Each of these situations represents a different type of collective action problem. These situations also feature many phenomena of central interest to political science, such as the role of institutions, political behavior, and policy implementation.