Joseph Heckman, PhD, is a professor of soil science, Rutgers University, where he teaches several courses: Soil Fertility, Organic Crop Production, Traditional Organic Food & Farming Systems, and Agroecology. He conducts research and extension programs on optimizing nutrition and soil quality in support of plant, animal, and human health. Dr. Heckman is chair of the Organic Management Systems Community within the American Society of Agronomy. He recently published book chapters in Soils and Human Health and in Organic Farming, the Ecological System. http://www.cook.rutgers.edu/~plantbiopath/faculty/heckman/heckman.html.