My research focuses on network systems from transportation and logistical ones, including supply chains, to financial, economic, and social networks and their integration, along with the Internet. I study and model complex behaviors on a spectrum of critical infrastructure networks with a goal towards providing frameworks and tools for understanding their structure, performance, and resilience, when coupled with human interactions and decision-making. I have contributed to the understanding of the Braess paradox in transportation networks and the Internet. I have also, with doctoral students and collaborators, been researching sustainability and quality issues with applications ranging from pharmaceutical and blood supply chains to perishable food products and fast fashion to humanitarian logistics. My team has advanced methodological and computational tools used in game theory, network theory, equilibrium analysis, and dynamical systems. I am presently a Co-PI on a multi-university NSF grant with UMass Amherst as the lead: Network Innovation Through Choice, which is part of the Future Internet Architecture (FIA) program and am also conducting research on risk management and cybersecurity.