Andrzej Wieckowski is Professor of Chemistry, University of Illinois at Urbana-Champaign. The author, coauthor, editor, or coeditor of over 220 professional papers, book chapters, and books, including Interfacial Electrochemistry (Marcel Dekker, Inc.), Dr. Wieckowski is a member of the American Chemical Society, the International Society of Electrochemistry, the Electrochemical Society, and the Electroanalytical Society. He received the Ph.D. (1973) and the D.Sc. (1981) degrees from the University of Warsaw, Poland. Elena R. Savinova is Senior Scientist, Boreskov Institute of Catalysis at the Russian Academy of Sciences, Novosibirsk, Russia, and Associate Professor, Novosibirsk State University, Russia. The author of more than 40 journal articles and book chapters, she serves as an associate editor for the journal Fuel Cells: From Fundamentals to Systems. She received the Honor Diploma (1981) in chemistry from the Novosibirsk State University, Russia, the Ph.D. degree (1988) in catalysis from the Russian Academy of Sciences, Novosibirsk, and the title of Associate Professor/Docent (1995) from the Novosibirsk State University. Constantinos G. Vayenas is Professor of Chemical Engineering, University of Patras, Greece. The author, coauthor, editor, or coeditor of more than 160 journal articles, book chapters, and books, he is a member of the Electrochemical Society, the International Society of Electrochemistry, and the North American Catalysis Society, among other organizations. He received the diploma (1973) in chemical engineering from the National Technical University of Athens, Greece, and the Ph.D. degree (1977) in chemical engineering from the University of Rochester, New York.