Phyllis R. Brown is Professor of Chemistry at the University of Rhode Island in Kingston, where she has taught since 1973. The author or coauthor of over 170 journal articles and several books, she edited the volume HPLC in Nucleic Acid Research. She also serves as an editorial board member for the Journal of Liquid Chromatography (both titles, Marcel Dekker, Inc.) and on the Advisory Board of Analytical Chemistry. Dr. Brown received the B.S. degree (1944) in chemistry from George Washington University, Washington, D.C., and the Ph.D. degree (1968) in chemistry from Brown University, Providence, Rhode Island. Eli Grushka is Professor of Analytical Chemistry at the Hebrew University of Jerusalem in Israel. He is the author or coauthor of over 130 scientific articles in the field of separation science. He is the editor or co-editor of several books, including New Developments in Separation Science and Preparative Scale Chromatography and he serves on the editorial boards of several journals, including Separation Science and Technology and Analytical Letters (all titles, Marcel Dekker, Inc.). Dr. Grushka received the B.S. degree (1963) from Long Island University, Brooklyn, New York, and the Ph.D. degree (1968) from Cornell University, Ithaca, New York.