Norman N. Li, PhD, is the President of NL Chemical Technology, Inc., and a member of the National Academy of Engineering. Dr. Li holds forty-five patents, has edited twenty books, and has received many honors, including the 2000 Perkin Medal presented by the Society of Chemical Industry American Section. Anthony G. Fane, PhD, is Director of the Singapore Membrane Technology Centre at NanyangTechnological University, Singapore. He is a Fellow of the Australian Academy of Technological Sciences and Engineering. W. S. Winston Ho, PhD, has been University Scholar Professor of Chemical Engineering at The Ohio State University. He holds more than fifty U.S. patents in separation processes and has won several awards, including the 2007 Clarence G. Gerhold Award from the American Institute of Chemical Engineers. Takeshi Matsuura, PhD, is a Professor of Chemical Engineering at University of Ottawa, Canada. He has published more than 300 papers in refereed journals, authored or coauthored three books, and edited four books.