DONALD T. SAWYER is Distinguished Professor of Chemistry at Texas A&M University, and from 1956 to 1986 was on the faculty of the University of California, Riverside. Professor Sawyer is the author of 300 research publications and coauthor of ten books, including Experimental Electrochemistry for Chemists, and Electrochemical Studies of Biological Systems. His numerous awards and appointments include election as a Fellow of the American Association for the Advancement of Science; Guggenheim, Merton College (Oxford), and JSPS Fellowships; and the Richard C. Tolman Medal. ANDRZEJ SOBKOWIAK is Professor of Chemistry at Rzeszow University of Technology. Since 1988 he has collaborated with Professor Sawyer on research into metal-induced activation of dioxygen species. JULIAN L. ROBERTS, Jr., is Professor of Chemistry at the University of Redlands, Redlands, California. A former NSF Science Faculty Fellow at Caltech, Professor Roberts is a collaborator with Professor Sawyer and a contributor to journals in electrochemistry.