With over 35 years of experience delivering occupational health and safety solutions, Catherine Simmons is a Board Certified Industrial Hygienist (CIH) in both comprehensive industrial hygiene and indoor environmental quality practice. She has worked across government, private industry, and consulting, and is recognized as an American Industrial Hygiene Association Fellow for her contributions to the profession. Her expertise includes exposure assessment and reconstruction, mathematical modeling of exposures, and authorship and editorial work on industrial hygiene publications, including AIHA’s Mathematical Models for Estimating Occupational Exposure to Chemicals.