Harris Bernstein, PhD, is a Professor in the Department of Cell Biology and Anatomy at the College of Medicine of the University of Arizona, and a member of the Arizona Cancer Center. Dr Bernstein’s long-term interest has been in the biological consequences of DNA damage. He has published on mechanisms of DNA repair and recombination, and DNA damage as the basis of aging. His current interest is in bile-acid-induced DNA damage and apoptosis in colon and esophageal cancer. He is a member of the American Society for Biochemistry and Molecular Biology and the Genetics Society of America, and is a Fellow of the American Academy of Microbiology.