David Campbell is a political scientist in the Human Ecology Department at the University of California, Davis. He works as a Community Studies Specialist for UC Cooperative Extension. The goal of his research and extension work is to deepen the practice of democratic citizenship in California communities. Taking community planning and service delivery systems as the unit of analysis, his research illuminates the policy dynamics and collaborative mechanisms that shape local implementation of federal, state, and foundation programs. His policy work has focused on welfare-to-work programs, youth civic engagement, and community food systems.