Mexican-American Concilio of Yolo County in California. Dr. Villarejo received his PhD, MS, and BS in physics from the University of Chicago.

Susanna G. Von Essen is a professor of internal medicine in the Pulmonary, Critical Care, Sleep and Allergy Section of the College of Medicine and a faculty member of the Environmental, Agricultural, and Occupational Health Sciences Department of the University of Nebraska Medical Center College of Public Health. Dr. Von Essen works as a pulmonary and critical-care physician, does research on agricultural health, and teaches on such topics as rural health and occupational pulmonary disorders. Her current research interests include gene-environment interactions associated with exposures to organic dust in production agriculture. She served on the Institute of Medicine committee that prepared the report Damp Indoor Spaces and Health and currently serves as a member of the Agricultural Health Study Advisory Panel. Dr. Von Essen received her MD from the Washington University School of Medicine, her MPH from the University of Michigan, and her undergraduate degree in zoology and German from the University of Nebraska-Lincoln.

James J. Zuiches is the vice chancellor for extension, engagement, and economic development at North Carolina State University. Dr. Zuiches leads and coordinates far-reaching programs in those fields at the university. His efforts include activities of the Cooperative Extension Service, the Industrial Extension Service, the Small Business and Technology Development Center, noncredit operations of the McKimmon Center for Extension and Continuing Education, the Economic Development Partnership, and the H. Hugh Shelton Initiative for Leadership Development. His research specialties include demography, rural sociology, and research administration. He was a professor in community and rural sociology and project leader for the National Coalition for Rural Entrepreneurship at Washington State University, where he also served as dean of the College of Agriculture and Home Economics for 8 years and director of Cooperative Extension and the Agricultural Research Center for 4 years. Dr. Zuiches served at Cornell University, Michigan State University, the National Science Foundation, and the W.K. Kellogg Foundation. He has more than 70 publications, including journal papers, book chapters, bulletins, and editorials. He is a Fellow of the American Association for the Advancement of Science, serves on the National Research Council Committee on the Review of NIOSH Research Programs, and has served as a member of the Board on Agriculture and Natural Resources. Dr. Zuiches received his PhD and MS in sociology from the University of Wisconsin-Madison and his BA in philosophy and sociology from the University of Portland, in Oregon.

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