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Dr. Pamela Williams, Principal and Owner of E Risk Sciences, LLP, has expertise in exposure assessment, retrospective exposure analysis, human health risk assessment, decision analysis, and risk communication.  She is also a Clinical Assistant Professor in the Department of Environmental and Occupational Health (EOH) at the University of Colorado.  She has taught undergraduate, graduate-level, and continuing education courses related to exposure and risk assessment methods and risk and decision-making practices at the Colorado School of Public Health, University of Colorado School of Pharmacy, Harvard School of Public Health, Clarkson University Institute for a Sustainable Environment, and American Industrial Hygiene Association (AIHA).  She is a Fellow with the non-profit organization Toxicology Excellence for Risk Assessment (TERA) and active member of the Alliance for Risk Assessment (ARA) Risk Assessment Advisory Committee.  Dr. Williams received both her Master of Science (MS) and Doctor of Science (ScD) degrees from the Harvard School of Public Health, Harvard University.  She is also a Certified Industrial Hygienist (CIH).

Dr. Williams has extensive scientific consulting experience and previously served as a Senior Science and Policy Advisor in the Office of Research and Development at the U.S. Environmental Protection Agency (EPA).  She has served as a Subject Matter Expert for the National Institute for Occupational Safety and Health (NIOSH) and the World Bank.  Her work has included conducting scientific literature reviews and data and modeling analyses of various chemicals in the environment, characterizing human exposures and health risks in occupational and community settings, designing and implementing indoor air exchange rate and exposure simulation studies, and designing environmental health education materials.  She has has authored or co-authored over 160 articles, book chapters, technical reports, and presentation abstracts on these topics, which includes 34 peer-reviewed publications.  She has also served as a peer reviewer for numerous journals, peer review panels, and government agencies.  She is on the editorial board of Risk Analysis: An International Journal and the journal Human and Ecological Risk Assessment.

Dr. Williams is a past President of the Society for Risk Analysis (SRA).  She previously served as the Chair of AIHA’s Risk Assessment Committee and Chair of SRA’s Exposure Assessment Specialty Group.  She is the 2007 recipient of the Joan M. Daisey Outstanding Young Scientist Award, granted by the International Society of Exposure Science (ISES) in recognition of outstanding contribution to the science of human exposure analysis by a young scientist, and the 2009 recipient of the Chauncey Starr Distinguished Award, granted by SRA in recognition of excellent contributions to the field of Risk Analysis.  She received a Fellow Award from SRA in 2012, granted in recognition of substantial achievement in science or public policy related to risk analysis and substantial service to the Society.  She received both a Leadership Award and Outstanding Individual Contributor Award from AIHA in 2014, granted in recognition of outstanding contributions to AIHA.  She received SRA’s 2015 President Award, granted in recognition of devoted and distinguished service to the Society, and SRA’s 2019 Richard J. Burk, Jr. Outstanding Service Award, granted in recognition of exceptional contributions to the field of risk analysis.


Dr. Katherine von Stackelberg, Principal and Owner of NEK Associates LTD, is a Consulting Scientist at E Risk and a Research Scientist at the Harvard Center for Risk Analysis.  Dr. von Stackelberg received an A.B. cum laude from Harvard College, and a Sc.M. and Sc.D. from the Harvard School of Public Health in Environmental Science and Risk Management.