Jason E. Johnston, M.S.
Senior Scientist

T: 202-557-3806
F: 202-557-3836
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BS, Tulane University, Chemical Engineering, 1986, summa cum laude

MS, Massachusetts Institute of Technology, Technology and Policy, 1988

MS, Massachusetts Institute of Technology, Chemical Engineering Practice, 1988



Jason E. Johnston, M.S., a Senior Scientist with Bergeson & Campbell, P.C. (B&C®), has 30 years of experience in the areas of exposure and risk assessment.  Mr. Johnston has conducted multiple exposure assessments in residential, occupational, hazardous waste, and consumer product settings in the U.S., Canada, European Union (EU), and South America. He   is well-suited to support clients before the U.S. Environmental Protection Agency (EPA), state regulatory agencies, and international regulatory authorities when exposure issues are raised in the context of agricultural and consumer pesticide registration and re-registration.  Mr. Johnston holds two Master of Science (MS) degrees from the Massachusetts Institute of Technology (MIT), one in Chemical Engineering Practice and one in Technology and Policy.

Mr. Johnston is an expert in the development of strategies for exposure mitigation using engineering controls, protective equipment, and improvement of label language pertaining to user safety. He manages and conducts dietary and non-dietary residential and occupational exposure assessments of pesticides, particularly those mandated by the EPA Food Quality Protection Act (FQPA), and has extensive experience in using and interpreting the data in occupational exposure databases (e.g., Ag Handlers Exposure Database, Pesticide Handlers Exposure Database, and European databases). On behalf of registrants, Mr. Johnston has designed and served as study monitor on magnitude of residue studies and environmental monitoring studies.  Mr. Johnston has also worked with industry task forces in developing pesticide occupational exposure data, developing a model to estimate aggregate and cumulative residential exposures to pesticides, developing a regulatory screening model to estimate exposures to antimicrobial agents used in the home, and in coordinating data development by task forces in response to regulatory requirements.

Representative Engagements:

  • Conducted, organized, and analyzed air monitoring data submitted by industry task force members for purpose of fulfilling regulatory data requirements.
  • Critiqued and provided comments on regulatory risk assessment for pesticide products in support of registration and regulatory review activities in the U.S. and Canada.
  • Conducted numerous dietary exposure and risk assessments for pesticide active ingredients.
  • Conducted numerous occupational and residential handler and post-application exposure and risk assessments for pesticide active ingredients.
  • Conducted exposure assessments for consumer products to support exemption from labeling requirements under Proposition 65.
  • Conducted assessments using software that estimates buffer zones for fumigants.


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