Céline Guéguen is professor of chemistry and Canada Research Chair in Aquatic Science and Biogeochemistry at Trent University, where she has been actively involved in teaching and research since 2007. She completed a PhD on the role of natural colloids in metal speciation in natural waters at the University of Geneva in 2001. Her research interests include determination of aquatic macromolecule compositions, concentrations and roles, metal speciation and bioavailability and development of new techniques for aquatic macromolecules and nanoparticles. She has published over 40 peer review papers and two book chapters. Mohammed Baalousha is Assistant Professor of Environmental Nanoscience at the University of South Carolina, USA, since 2014. He received a MSc degree in Applied Mechanics in 2002 and a PhD in Environmental Biogeochemistry in 2006 from the University of Bordeaux, France, followed by a postdoctoral appointment at the University of Birmingham, UK. His major research interests are characterization and environmental fate of nanomaterials. S.

Kim R. Williams is professor of chemistry and the Director of the Laboratory for Advanced Separations Technologies at the Colorado School of Mines. She began working with field flow fractionation as a postdoctoral fellow with the inventor of the technique, the late J. Calvin Giddings at the University of Utah, in 1987. She subsequently became the Assistant Director of the Field-Flow Fractionation Research Center and an Adjunct Assistant Professor at the University of Utah. In 1997, Kim joined the faculty of the Chemistry Department at the Colorado School of Mines. Research in the Williams group focuses on developing new capabilities for nanoparticle and macromolecular analyses using field flow fractionation and related methods.