Heidi C. O’Neill, Ph.D., DABT, is a highly accomplished toxicologist with more than two decades of experience investigating the effects of chemical compounds on human health — both as pharmacological therapeutics with the potential to benefit and as toxicants with the potential to harm. As a Senior Toxicologist at Intertox, Inc., Dr. O’Neill brings deep expertise in human health risk assessment for consumer products, industrial chemicals, and regulated substances, with a particular focus on flavoring compounds, solvents, organophosphates, pesticides, and extractable and leachable chemicals. Her career reflects an exceptional ability to translate complex toxicological science into practical, defensible guidance for regulatory, litigation, and industry audiences alike.