Baoshan Xing is Professor of Environmental and SoilChemistry in the Department of Plant, Soil, and Insect Sciences,University of Massachusetts Amherst, where he has been activelyinvolved in teaching and research since 1996. Dr. Xing received hisPhD from the University of Alberta, Canada, in 1994. His researchwork ranks in the top 1% of cited authors for journals inenvironmental sciences and ecology. Nicola Senesi is Professor of Soil Chemistry and Head ofthe Department of Agroforestal and Environmental Biology andChemistry of the University of Bari, Bari, Italy, where he has beenactively involved in research and teaching (as research assistant,assistant professor, and associate professor) since 1969. He wasconferred a Doctorate Honoris Causa by the Institut NationalPolytechnique de Toulouse, France, in 2000. The late Pan Ming Huang received his PhD in soil sciencefrom the University of Wisconsin Madison. He was ProfessorEmeritus of Soil Science at the University of Saskatchewan,Saskatoon, Canada. His research work has significantly advancedknowledge on the formation chemistry and the nature and surfacereactivity of mineral colloids, organic matter, and organomineralcomplexes of soils and sediments and their role in the dynamics,transformations, and fate of nutrients, toxic metals, andxenobiotics in terrestrial and aquatic environments.