of agricultural technologies; and geologic carbon sequestration. He received his Ph.D. in economics from the University of Chicago.

Justin Derner, Ph.D., is research leader for the Rangeland Resources Research Unit of the U.S. Department of Agriculture (USDA) Agricultural Research Service. Currently, Dr. Derner leads a multidisciplinary team of scientists developing and providing land managers with the necessary tools to address the interface of contemporary production-conservation issues related to provision of ecosystem goods and services on western U.S. rangelands. His research ascertains the effects of livestock as ecosystem engineers, alone or in combination with fire and prairie dogs, to influence vegetation heterogeneity, modify states of vegetation, and affect resilience within ecological sites of semiarid rangelands. Research efforts target management strategies for mitigation and adaptation of climate change on rangelands by evaluating dynamics of soil carbon and nitrogen as influenced by management X environment (weather/climate) effects. Dr. Derner is a principal investigator for the Central Plains Experimental Range site of the Long-Term Agro-ecosystem Research network, a co–principal investigator on the National Science Foundation- (NSF-) funded Shortgrass Steppe Long-Term Ecological Research Project. In addition, he is an affiliate faculty member in the Department of Ecosystem Science and Management at the University of Wyoming and the Department of Forest and Rangeland Stewardship at Colorado State University. He received his Ph.D. in rangeland ecology and management from Texas A&M University.

Michael P. Doyle, Ph.D., is a Regents Professor of Food Microbiology and director of the Center for Food Safety at the University of Georgia. He is an active researcher in the area of food safety and security and works closely with the food industry, government agencies, and consumer groups on issues related to the microbiological safety of foods. He serves on food safety committees of many scientific organizations and has been a scientific advisor to many groups, including the World Health Organization, Institute of Medicine (IOM), National Academy of Sciences (NAS)-NRC, International Life Sciences Institute-North America, Food and Drug Administration, USDA, Department of Defense, and Environmental Protection Agency. He is a Fellow of the American Academy of Microbiology, American Association for the Advancement of Science, and International Association for Food Protection and the Institute of Food Technologists, and is a member of the IOM. Dr. Doyle received his B.S., M.S., and Ph.D. degrees from the University of Wisconsin in bacteriology/food microbiology.

Jonathan E. Fielding, M.D., M.P.H., M.B.A., is the director of the Los Angeles County Department of Public Health, and a professor at the Schools of Public Health and Medicine at the University of California, Los Angeles.

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