Henry H. Willis is associate director of the RAND Homeland Security and Defense Center. Willis has applied risk analysis tools to resource allocation and risk management decisions in the areas of public health and emergency preparedness, homeland and national security policy, energy and environmental policy, and transportation planning. He is the author of dozens of publications, book chapters, and op-ed pieces and has testified before Congress as an expert on applying risk analysis to homeland security policy. Willis's recent research has involved assessing the costs and benefits of terrorism security measures like the Western Hemisphere Travel Initiative and evaluating the impact of public health emergency preparedness grant programs like the Cities Readiness Initiative. Willis earned his B.A. in chemistry and environmental studies from the University of Pennsylvania, his M.A. in environmental science from the University of Cincinnati, and his Ph.D. from the Department of Engineering and Public Policy at Carnegie Mellon University.