About Us

Ari S. Lewis, M.S.

Principal, Gradient

Ari S. Lewis, M.S.

Ms. Lewis has over 10 years of consulting experience, with an emphasis on toxicological evaluation and human health risk assessment. Her expertise in toxicology and risk assessment allows her to lead and contribute to a variety of projects, including, product safety evaluations, regulatory comment, and green chemistry assessments. She has published and presented extensively on the carcinogenic risks of metals, and provided direct input to US EPA on risk assessment issues. She has extensive expertise in conducting hazard assessments according the Globally Harmonized System (GHS) for Labelling and Classification. With this expertise, Ms. Lewis has led several risk ranking and hazard evaluation projects, including the oversight of a program involving the hazard assessment of hundreds of chemicals for the purpose of new chemical notifications and SDS updates in multiple countries. She also serves a leadership role on Gradient Green Chemistry and Sustainability Practice. Ms. Lewis earned her M.S. at Cornell University in Environmental Toxicology.