Cynthia Rider, PhD, DABT, is a toxicologist with the National Institute of Environmental Health Sciences (NIEHS), where she serves as project leader for a diverse portfolio of testing programs including polycyclic aromatic compounds, botanical dietary supplements, and industrial chemicals. Dr. Rider’s research interests are in evaluating and refining methods to predict mixture toxicity based on data from components or whole reference mixtures. She received her B.S. from Tulane University in Environmental Studies and Biology and her Ph.D. from North Carolina State University in Environmental Toxicology. She completed postdoctoral training in the Reproductive Toxicology Branch of the National Health and Environmental Effects Research Laboratory, U. S. Environmental Protection Agency and the Nicholas School of the Environment at Duke University.