JOYCE TSUJI is a principal scientist and director of the Center for Toxicology and Mechanistic Biology in the Health Sciences Practice of Exponent, Inc. She is a board-certified toxicologist and a fellow of the Academy of Toxicological Sciences. She specializes in assessing health and environmental risks associated with chemicals in the environment or from consumer products. She has designed and implemented programs involving exposure assessment, biomonitoring, health education, and exposure intervention for populations with food-chain or environmental exposures. Dr. Tsuji has been recognized as an expert in risk assessment and toxicology in the United States and internationally on assignments for private clients, the U.S. Environmental Protection Agency, the U.S. Department of Justice, the Australian Environmental Protection Agency, and the states of New Jersey and Washington. She is currently serving on the National Research Council Committee on Toxicology and the Standing Committee on Risk Analysis Issues and Reviews, and she has previously served on the Committee on Spacecraft Exposure Guidelines, the Committee on Submarine Escape Action Levels, the first Committee on Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants, and the Committee on Copper in Drinking Water. Dr. Tsuji received her PhD from the Department of Zoology with an emphasis in physiology and ecology at the University of Washington.