My ongoing research builds on my doctoral work, focusing at a theoretical level on cross-boundary collective action dilemmas and at a practical level on the design of collaborative governance arrangements that transcend political borders and putting them into effect on the ground.  The goal is to push toward a generalizable theory of cross-border, cross-scale governance and link this back to large-scale environmental management. In the process, I try to understand how to implement these cross-border governance arrangements and collaborative efforts, create institutional robustness or long-enduring institutional arrangements, and understand how to design sustainable systems in coupled social-ecological environments.  I pursue this research agenda through four ongoing programs. First, I lead a project at the local and regional level in the Arizona borderlands that uses social network analysis and spatially-explicit institutional analysis to help develop a better understanding of cross-border governance, focusing on environmental management issues in the face of regional climate changes and the ongoing border crisis – impacts that cross political boundaries. The second spoke in the research plan brings together common-pool resource scholars with leading international regime researchers in the study of large-scale commons to see how both sets of theories scale up and down.  In this, I lead a research team that is in the process of coding cases and building a database to enable statistical analysis and combine quantitative and qualitative analyses to examine cross-scale environmental governance.  A third research program uses agent-based modeling to study the effects of environmental management with multiple objectives in a network of linked habitats.  Fourth, I continue to collaborate with researchers in southern Africa on a number of large-scale conservation/development projects in the region with a focus on governance across borders and collaboration in general.