LESTER PACKER is Professor of Molecular and Cell Biology, Division of Cell and Developmental Biology, University of California, Berkeley. Dr. Packer is the author of over 500 published articles and coeditor of the Handbook of Antioxidants, Oxidative Stress in Dermatology, Vitamin E in Health and Disease, Retinoids: Progress in Research and Clinical Applications, and Biothiols in Health and Disease (all tides, Marcel Dekker, Ine.). He is President of the Oxygen Club of California, President of the International Society of Free Radical Research, and a member of the Oxygen Society, the American Society of Biochemistry and Molecular Biology, and the American Institute of Nutrition, among others. Dr. Packer received the B.S. (1951) and M.S. (1952) degrees in biologyand chemistry from Brooklyn College, Brooklyn, New York, and the Ph.D. degree (1956) in microbiology and biochemistry from Yale University, New Haven, Connecticut., ENRIQUE CADENAS is a Professor in and Chairman of the Department of Molecular Pharmaeology and Toxicology in the School of Pharmacy and a Professor of Biochemistry in the School of Medicine, University of Southern California, Los Angeles. The author of over 160 professionai publications and coeditor of the Handbook of Antioxidants and Biothiols in Health and Disease (both titles, Marcel Dekker, Inc.), Dr. Cadenas is a member of the American Chemical Society, the American Society of Photobiology, the Biochemical Society (United Kingdom), and the European Society for Photobiology, among others. Dr. Cadenas received the M.D. degree (1973) and the Ph.D. degree (1977) in biochemistry from the University of Buenos Aires School of Medicine, Argentina.
