Ms. Lewis is an Environmental Toxicologist and the manager of the Toxicology team. Her expertise in toxicology and risk assessment allows her to manage and contribute to a variety of projects, including site-specific risk assessments, regulatory comment, product safety evaluation, and litigation support. She also has particular expertise in metal and pesticide risk assessment — specifically arsenic. In this capacity, Ari has both published and presented extensively on the carcinogenic risks of arsenic, and provided direct input to US EPA on arsenic regulatory issues. For litigation cases, she has performed comprehensive evaluations of toxicological and epidemiological literature to support causation analyses. Before joining Gradient, Ms. Lewis earned her M.S. at Cornell University; her thesis project investigated the molecular and cellular responses to arsenic exposure during early animal development.