Dr. David J. Doolittle is currently Principal Scientist and Manager of the Laboratory of Environmental and Molecular Toxicology at R. J. Reynolds Tobacco Company in Winston-Salem, NC. He also holds appointments as Adjunct Assistant Professor of Toxicology at Duke University Medical Center, Durham , NC, as well as Adjunct Associate Professor of Physiology and Pharmacology at Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, NC. Dr. Doolittle earned his Ph.D. in Pharmacology and Toxicology from Michigan State University and completed a Postdoctoral Fellowship at the Chemical Industry Institute of Toxicology, Research Triangle Park, NC. Dr. Doolittle was certified as a Diplomate of the American Board of Toxicology in 1985 and recertified in 1990 and 1995. He currently serves on the editorial boards of the journals, Food and Chemical Toxicology and Fundamental and Applied Toxicology, and on the scientific advisory board of BELLE (Biological Effects of Low Level Exposures) at the University of Massachusetts. Dr. Doolittle has authored or co-authored approximately 60 publications in peer-reviewed scientific journals, has co-authored a chapter in the standard toxicology textbook, Principles and Methods of Toxicology, and has authored or co-authored approximately 70 published abstracts of scientific presentations. He is an active member of the American Association for the Advancement of Science, the Environmental Mutagen Society, the Genotoxicity and Environmental Mutagen Society, MENSA, and the Society of Toxicology. Dr. Doolittle's current research interests are in the areas of molecular dosimetry as well as genetic susceptibility to carcinogenesis.