KERRY J. HOWE is an Associate Professor of Civil Engineering at the University of New Mexico and former principal engineer at MWH. His teaching and research focuses on water quality, membrane processes, desalination, and advanced water treatment technologies. DAVID W. HAND is a Professor of Civil and Environmental Engineering at Michigan Technological University. He has authored or coauthored over 130 technical publications including six textbooks, two patents, and eight copyrighted software programs. JOHN C. CRITTENDEN is Director of the Brook Byers Institute for Sustainable Systems as well as Hightower Chair and Georgia Research Alliance Eminent Scholar in the School of Civil and Environmental Engineering at Georgia Institute of Technology. R. RHODES TRUSSELL is the founder of Trussell Technologies and former senior vice president at MWH. He has served as Chair of the Water Science and Technology Board for the National Academies and, in 2010, was awarded the prestigious A. P. Black Research Award from the American Water Works Association. GEORGE TCHOBANOGLOUS is Professor Emeritus of Civil and Environmental Engineering at the University of California, Davis. He is the author or coauthor of more than 500 technical papers and a number of textbooks, including Wastewater Engineering: Treatment and Reuse and Water Reuse: Issues, Technologies, and Applications.