Mrs. Melinda Donnell is a toxicologist with Paustenbach and Associates, based in California. She received her M.P.H. in Environmental Health Sciences & Policy from George Washington University in 2017; her graduate thesis work focused on the effects of titanium dioxide nanoparticles on oxidative stress in mice brain. Additionally, she contributed to a project in which she evaluated the EPA’s use of the database uncertainty factor (UFD) in their risk assessment model. Melinda specializes in toxicology, exposure and risk assessments, and litigation support. Her primary areas of training and interest include evaluating and understanding the toxicology, potential exposure, and hazard and risk to consumers and in occupational settings associated with various chemicals, including per- and polyfluoroalkyl substances (PFAS), chemicals associated with electronic nicotine delivery systems (ENDS), chemicals found in consumer products and foods, and chemicals listed on the Proposition 65 list of carcinogens.