Will P. Gates, PhD, is a Senior Research Fellow at the Institute for Frontier Materials, Deakin University, Victoria, Australia. He received his PhD in Clay Mineralogy and Soil Physical Chemistry at the University of Illinois, Urbana-Champaign, Illinois, USA in 1994, and MSc at New Mexico State University, Las Cruces, New Mexico, USA in 1987 and a BSc at Montana State University, Montana, USA. He joined the CSIRO (Adelaida, South Australia, Australia) as a Senior Research Scientist in 1997 and since that time has applied a variety of spectroscopic tools, clay mineralogy and physical chemistry to the study and application of bentonites and bentonite products in the waste (containment and reuse), chemicals (synthesis, green chemistry), mining (barriers, tailings dewatering and water reuse), agricultural and mineral exploration industries. He was recipient of the Marion L., and Christie M. Jackson Mid Career Clay Science Award by The Clay Minerals Society, Chantilly, Virginia, USA. J. Theo Kloprogge MSc Geology, PhD Geology/Chemistry, is an Honorary Senior Fellow, at School of Earth Sciences, University of Queensland, and Editor/Author of CMS Workshop Lectures Volume 13 - The Application of Vibrational Spectroscopy to Clay Minerals and Layered Double Hydroxides. During the past 25+ years Dr. Kloprogge has been working as a mineralogist and spectroscopist. The results of this work have been published in more than 250 papers in international peer reviewed journals as well as in a number of book chapters. He has been collecting minerals for more than 35 years and has built an extensive collection both for research and private use. Slovak Academy of Sciences, Institute of Inorganic Chemistry, 845 36 Bratislava, Slovakia Centre National de la Recherche Scientifique, Centre de Recherche sur la Matiere Divisee, Orleans, France