I work at the intersection of the computational, social, behavioral and economic sciences. My research group combines agent-based computing with micro-data to build large-scale models having high verisimilitude with the real-world. We have worked on a variety of policy issues, from housing to fisheries, behavioral aspects of retirement and science policy. I supervise Ph.D. students in Mason's Computational Social Science Ph.D. program. I also serve on Ph.D. committees from other departments when the work involves agent-based modeling, e.g., Economics, Systems Engineering and Operations Research, Public Policy, and Civil and Infrastructure Engineering. I have been visiting Professor at the University of Oxford (UK), the New School for Social Research (NY), and Middlebury College (Vermont). My research has been published in leading general interest journals ("Science," "Nature" and "Proceedings of the National Academy of Sciences"), in field journals (e.g., "American Economic Review," "Economic Journal", "Computational and Mathematical Organization Theory," "Journal of Industrial Ecology"), and reprised in newspapers (e.g., "Wall St. Journal," "Washington Post") and technology publications (e.g., "Scientific American," "Technology Review," "Wired").