This workshop session will highlight the key differences in terminology, objectives, and methods among occupational risk assessment methods used for different purposes. Presentations and discussions will focus on baseline occupational and environmental health information and safety data collection and assessment processes, and look at common scenarios from different contexts such as TSCA occupational risk evaluations, health and safety compliance, research, and product stewardship programs.

The goal of protecting worker health is shared by all occupational risk assessors and IH professionals. Different domains of occupational risk assessment use different approaches that are “fit-for-purpose”. For example, facilities often take a “bottom-up” approach, in which data and risk management methods are site- or even task-specific. Conversely, regulatory risk evaluations often take a “top-down” approach, in which the risk evaluations are meant to cover broader conditions of use (e.g., chemical manufacturing, uses, or disposal ). While each domain conducts assessments for its intended purpose, a comparison of approaches can highlight the considerations when extrapolating data collected under one approach for use in another domain.


Fred Boelter

Fred Boelter, CIH, PE, BCEE, FAIHA, Boelter Risk Sciences and Engineering LLC

He has since 1973 been professionally assessing and resolving questions and concerns with his technical and management skills in industrial hygiene and environmental engineering. Fred has consulted with clients throughout the United States, the UK, and Europe as well as in more than 30 other countries abroad on a wide range of risk characterization, risk communication, and risk management matters in occupational health, public health, and environmental impacts. Fred is Certified in the Comprehensive Practice of Industrial Hygiene, a Licensed Professional Engineer, and a Board Certified Environmental Engineer. Fred is also a Fellow of the AIHA and a recipient of national awards including the Edward J. Baier, the Henry F. Smyth, and the Donald E. Cummings.

Majd El-Zoobi

Majd El-Zoobi, PE, Chemical Engineer, U.S. EPA Office of Chemical Safety and Pollution Prevention, Existing Chemicals Risk Assessment Division

He has 18 years of experience at EPA as a Chemical Engineer in the Office of Chemical Safety and Pollution Prevention (OCSPP) and his experience includes occupational exposure assessment. Prior to joining EPA, he worked as a project, process design, and production engineer in the chemical industry for 14 years. Mr. El-Zoobi obtained a B.S. in chemical engineering from Virginia Tech and an M.S. in chemical engineering from Louisiana State University. He is a registered professional engineer in chemical engineering in Louisiana.

William Perry

William Perry, CIH, retired – former Directorate of Standards and Guidance at OSHA

He was Director of the Directorate of Standards and Guidance at the U.S. Occupational Safety and Health Administration (OSHA) from August 2014 to January 2020. Prior to that, he served as Deputy Director and as an Office Director in DSG. As Director, he was responsible for leading the development of standards and guidance products covering a wide variety of occupational safety and health hazards. He oversaw regulatory and guidance development on a wide range of topics, including safety and health management programs, crystalline silica, beryllium, fall protection, hazard communication and permissible exposure limits, maritime and agricultural safety, and economic impact analysis. He also directed the Agency’s initiatives to promote the implementation of safety and health programs by employers.

Mr. Perry has 40 years of experience as an industrial hygienist, senior health scientist, and policy analyst on occupational safety and health regulation. Mr. Perry began his Federal career at the Occupational Safety and Health Administration (OSHA) in 1994 as a Health Scientist in the Directorate of Health Standards. Over his 26 years at OSHA, and as a contractor to OSHA prior to that, Mr. Perry served on several project teams to develop standards for crystalline silica, hexavalent chromium, butadiene, respiratory protection programs, updating of permissible exposure limits for hazardous chemicals, ergonomics, and a number of safety standards. His contributions included developing health and risk assessments for both cancer and non-cancer health effects and evaluating the effectiveness of alternative exposure control approaches.

Mr. Perry graduated from the University of Maryland in 1975 with a Bachelor of Science degree in Microbiology, and earned a Master’s degree in Microbiology in 1978. He has been certified in the Comprehensive Practice of Industrial Hygiene since 1990.

Christine Whittaker, Ph.D.

Christine Whittaker, PhD, Director, Division of Science Integration, NIOSH/CDC

She is Director of the Division of Science Integration (DSI) at the National Institute for Occupational Safety and Health (NIOSH) in Cincinnati, Ohio. She directs a diverse, interdisciplinary division responsible for conducting research and developing NIOSH authoritative recommendations and communication products related to occupational safety and health. Until 2022, she was the Chief of the Risk Evaluation Branch within DSI and led a team of toxicologists, epidemiologists, and statisticians conducting risk analyses of workplace hazards. She has served on several interagency committees, including the Office of Science Technology and Policy Working Group on Contaminants of Emerging Concern and the ATSDR Minimal Risk Level Working Group, and has worked directly with the EPA on occupational toxicology and risk assessment in its Toxic Substance Control Act risk evaluations. Dr. Whittaker received her Ph.D. in Environmental Toxicology from the University of California, Irvine in 1991. She has co-authored more than a dozen peer-reviewed journal articles, book chapters, and government reports and was recognized as a NIOSH Distinguished Career Scientist in 2019. Dr. Whittaker is currently serving as the Vice President of the Exposure Specialty Section in the Society of Toxicology and the Secretary/Treasurer of the Occupational Health and Safety Specialty Group in the Society for Risk Analysis.


  • Dr. Paul Price, retired exposure and risk assessor from the Office of Research and Development of the U.S. Environmental Protection Agency
  • Brenda Finter, Industrial Hygienist for the U.S. Department of Labor, Office of Chemical Hazards - Metals, Directorate of Standards and Guidance, OSHA

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