Applications of Computational Methods in Toxicology Jason Pirone, Constella Health Sciences The existence of large mathematical modeling programs at the National Institute of Environmental Health Sciences (NIEHS), the US Environmental Protection Agency (EPA), and the Agency for Toxic Substances and Disease Registry (ATSDR) attests to the degree to which computational methods have become important in toxicology. Computational methods provide a means for addressing the imbalance between the rapidity at which new chemicals are introduced into the market and the time-intensive nature of traditional testing methods. In this talk, aspects of computational toxicology relevant to work done at Constella in collaboration with the National Toxicology Program (NTP) and other governmental and academic entities will be discussed. This talk will emphasize the uses of physiologically-based modeling in the risk assessment process.