I am the Principal Investigator at his sole proprietor consulting company, TWA8HR Occupational Hygiene Consulting, LLC established in 2008. I have a s Bachelor of Science in Chemistry, Master of Science in Environmental Health, and PhD in Environmental Engineering, all from Drexel University, Philadelphia, PA. I am certified in the comprehensive practice of industrial hygiene (CIH), and am a Fellow of the American Industrial Hygiene Association. I am a longtime member of the American Industrial Hygiene Association and the Society for Risk Analysis. Before I retired from ExxonMobil Biomedical Sciences in 2008, I was a Senior Scientific Associate in Exposure Sciences. My career in anticipating, recognizing, evaluating, controlling and confirming control of occupational health risks spans over 40 years in multiple industries. Mty ongoing activities include exposure assessment for epidemiology studies, mathematical methods to estimate exposures to chemicals, quantitative risk assessments for Legionella and Legionnaires’ disease and risk assessments for other hazards. I have over 30 peer reviewed publications, and have published chapters in books on exposure assessment strategies, mathematical modeling to estimate exposures, and risk assessment approaches. He have been the lead instructor for American Industrial Hygiene Association (AIHA) professional development courses on mathematical modeling to assess chemical exposures, and Monte Carlo Simulation techniques in exposure assessment.