Baoshan Xing is Professor of Environmental and Soil Chemistry in Stockbridge School of Agriculture, University of Massachusetts Amherst, where he has been actively involved in teaching and research since 1996. Dr. Xing received his PhD from the University of Alberta, Canada, in 1994. His research work ranks in the top 1% of cited authors for journals in environmental sciences and ecology. Chad Vecitis is an Associate Professor of Environmental Engineering (since 2010) in the Paulson School of Engineering and Applied Sciences, Harvard University. He received his PhD from Caltech in 2009. Along with students and colleagues, he has published over 25 refereed articles. He has been invited to present his research results at many universities and institutions. Nicola Senesi is Professor Emeritus of Soil Chemistry and was Head of the Department of Agroforestal and Environmental Biology and Chemistry of the University of Bari, Bari, Italy, where he has been actively involved in research and teaching (as research assistant, assistant professor, and associate professor) since 1969. He was conferred a Doctorate Honoris Causa by the Institut National Polytechnique de Toulouse, France, in 2000.