Jason E. Johnston, M.S.
Senior Scientist
 

 
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EDUCATION:

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

 
 

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Jason E. Johnston, M.S., a Senior Scientist with Bergeson & Campbell, P.C. (B&C®), has more than 25 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 a 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 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.

Mr. Johnston has served as the project manager or senior scientist on a diverse range of residential, dietary, and microbial exposure and risk assessments as required under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA); Maximum Allowable Dose Level (MADL) and No Significant Risk Level (NSRL) development assessments under Proposition 65; and Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)/Resource Conservation and Recovery Act (RCRA) hazardous waste site assessments.

Before joining B&C, Mr. Johnston was Senior Scientist with global chemical company FMC Agricultural Solutions (formerly Cheminova) and held positions with environmental science consulting firms. He is a frequent speaker and presenter at scientific meetings and is a regular participant in professional societies that provide additional knowledge on the changing field of exposure and risk assessment.

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 assessments using software that estimates buffer zones for fumigants.

Professional & Community Involvement:

Member of the International Society of Exposure Science (ISES)

Member of the American Chemical Society

Publications:

Reiss R, Johnston J, Tucker K, DeSesso JM, Keen CL, "Estimation of cancer risks and benefits associated with a potential increased consumption of fruits and vegetables," Food and Chemical Toxicology 2012, 50:4421–4427.

Young BM, Tulve NS, Egeghy PP, Driver JH, Zartarian VG, Johnston JE, Delmar CJE, Evans JE, Smith LA, Glen G, Lunchick C, Ross JH, Xue J, Barnekow DE, "Comparison of four probabilistic models (CARES®, Calendex™, ConsExpo, and SHEDS) to estimate aggregate residential exposures to pesticides," Journal of Exposure Science and Environmental Epidemiology 2012 September/October; 22:522–532.

Petersen BJ, Petersen SR, Barraj L, Johnston JE, "Using two-day food consumption survey data for longitudinal dietary exposure analyses," Assessing Exposures and Reducing Risks to People from the Use of Pesticides, Seiber JN, Krieger RI, Ragsdale N (eds), Oxford University Press, 2007.

Pirages SW, Johnston JE, "Municipal waste combustion and new source performance standards: Use of scientific and technical information," Keeping Pace with Science and Engineering: Case Studies in Environmental Regulation, National Academy Press, Washington, DC, 1993.

Speaking Engagements:

Johnston, JE, A Klemens, and J Van Alstine, "Impact of recent changes in pesticide exposure assessment procedures on dietary, residential, and aggregate exposure estimates." Oral presentation at the American Chemical Society (ACS) National Meeting, Indianapolis, Indiana (2013).

Johnston JE, Bi X, Driver JH, Ross JH, Selim S, "Pet spot-on products: Comparison of biomonitoring data and exposures estimated with regulatory models." Presented as part of a Symposium (Pesticide exposure and modeling: Lessons learned in environmental and occupational exposure analysis leading to advances in dietary and non-dietary pesticide assessments) at the International Society of Exposure Science (ISES) Annual Conference, Seattle, Washington (2012).

Johnston JE, Klemens A, Van Alstine J, "Dietary exposure assessment for pesticides: Impact of updated consumption data on estimated exposures." Presented as part of a Symposium (Pesticide exposure and modeling: Lessons learned in environmental and occupational exposure analysis leading to advances in dietary and non-dietary pesticide assessments) at the International Society of Exposure Science (ISES) Annual Conference, Seattle, Washington (2012).

Reiss R, Johnston JE, DeSesso J, Tucker K, "Pesticide residues on food: A mountain or a molehill." Presented at the Society for Risk Analysis (SRA) Annual Meeting, Charleston, South Carolina (2011).

Johnston JE, Bi X, "Regulating pesticide products used in the home: Comparison of biomonitoring data and exposures estimated with regulatory models." Presented at the American Chemical Society (ACS) Semi-Annual Meeting, Denver, Colorado (2011).

Johnston JE, "Overview of risk assessment results for the JITF inert ingredient clusters." Presented as part of a Symposium (New challenges in formulation regulation for agrochemicals) at the American Chemical Society (ACS) Semi-Annual Meeting, San Francisco, California (2010).

Young B, Driver J, Zartarian V, Xue J, Smith L, Glen G, Johnston JE, Delmaar C, Tulve N, Evans J, "Dermal, inhalation, and incidental exposure results from the models: How did they handle the data?" Presented as part of a Symposium (State-of-the-science probabilistic aggregate and cumulative residential exposure models and recent residential exposure measurement studies: How the data and models compare) at the International Society for Environmental Epidemiology & International Society of Exposure Analysis Joint Annual Conference, Pasadena, California (2008).

Johnston JE, Smith K, Wang C, Petersen B, McCormick W, Shah H, "A new model to assess incidental ingestion exposures to residential countertop cleaning products." Presented at the International Society of Exposure Analysis/International Society for Environmental Epidemiology Annual Conference, Paris, France (2006).

Barraj, L, JE Johnston, and CG Scrafford, "Investigating the impact of certain assumptions on estimates of long-term occupational exposures to agricultural pesticides." Oral presentation at the Society for Risk Analysis Annual Meeting, Palm Springs, California (2004).

Johnston JE, Petersen B, Petersen S, "A data-matching algorithm to generate longitudinal dietary consumption pattern profiles." Presented at the International Society of Exposure Analysis Annual Conference, Philadelphia, Pennsylvania (2004).

Johnston JE, Merricks DL, "Improvement in worker exposure and risk assessment using biomarkers: A case study." Presented at the Society for Risk Analysis Annual Meeting, New Orleans, Louisiana (2002).

Johnston JE, Walls CL, Petersen B, "Calendex™: A calendar-based model to assess aggregate exposure." Presented at the International Society of Exposure Analysis Annual Conference, Charleston, South Carolina (2001).

Johnston JE, Walls CL, "Calendex™ overview and results of aggregate assessments." Presented at the Scientist-to-Scientist Model Comparison Meeting of Residential Aggregate Human Exposure Models sponsored by the USEPA Environmental Research Center, Research Triangle Park, North Carolina (2001).

Johnston JE, Hentz K, "Advanced topics in risk assessment." Day-long continuing education seminar presented at the Professional Conference on Industrial Hygiene sponsored by the American Academy of Industrial Hygiene (1997 and 1998).


 
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