John Tower Professor of Biological Sciences at University of Southern California. Dr. Tower received his PhD in 1988 from The Johns Hopkins University School of Medicine, Biochemistry, Cellular, and Molecular Biology Training Program.  Dr. Tower has been investigating the molecular genetics of aging in Drosophila since 1989, with a particular emphasis on transgenic technologies, hsps, superoxide dismutase, p53 and the role of sexual differentiation.