Dr. Bruno Glaser is Assistant Professor at the Institute of Soil Science and Soilnbsp;Geography at the University of Bayreuth. For over seven years he has been conducting Amazonian dark earth research from a soil science perspective including soil fertility, sustainability, and archaeology aspects.Dr. William Woods is Professor in the Department of Geography and Director of the Archaeology Program at Southern Illinois University Edwardsville. For over thirty years he has been conducting prehistoric and historic settlement-subsistence research in the eastern United States, Latin America, and Europe.