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Katherine Walker

Principal Scientist

Katy Walker joined HEI in 2009 after a career in environmental consulting and research on the estimation of environmental health risks and their role in decisions about public health protection. Her particular focus has been on the analysis of variability and uncertainty in human health risks and on the use of expert subjective judgment for that purpose. For the U.S. EPA Office of Air and Radiation, she led an expert elicitation study with Industrial Economics, Inc., to characterize uncertainty in the relationship between long-term inhalation exposures to fine particulate matter (PM2.5) and premature mortality in the United States, work that has been used in analysis of the benefits of proposed regulations to reduce PM2.5 emissions. Walker is a member of the U.S. EPA’s Science Advisory Board on EPA’s White Paper on Expert Elicitation. She received a M.Sc. in Environmental Health Sciences/Industrial Hygiene and a Sc.D. in Environmental Health Sciences/Biostatistics and Decisions Sciences from the Harvard School of Public Health.