John Griffin

John R. Griffin

Managing Scientist
Health Sciences

Mr. Griffin has over 15 years of experience in the areas of risk assessment, exposure assessment, air emissions modeling, database development, and geographical information systems (GIS). He performs risk assessments associated with consumer, occupational, and environmental exposure to a variety of chemicals including asbestos, petroleum compounds, dioxins, PCBs, and chlorinated solvents. He has utilized GIS-based site risk assessments to guide remedy and cleanup decisions and prepared GIS-based region-wide population risk assessments to evaluate the long-range transport of chemicals in the environment. He has particular expertise in creating, managing, and analyzing large environmental sampling datasets.

Mr. Griffin has used his database and analysis expertise to evaluate the National Emissions Inventory and the National Scale Air Toxics Assessment, on behalf of industry groups. He also has extensive experience analyzing various state and federal air monitoring and drinking water monitoring databases in the context of litigation and industrial facility permitting. He assisted in the development of the PERFUM model, which is a probabilistic exposure model utilized by EPA to evaluate the risks associated with soil fumigant applications. He has also provided consulting services related to the preparation and submission of Premanufacture Notices (PMNs) under TSCA and the registration and reregistration of agrochemicals under FIFRA.

He has provided risk and exposure assessments for air emissions sources such as diesel engines, ceramic product kilns, coal-fired power plants and coke oven batteries. He has evaluated exposure and risks from vapor intrusion at residential, commercial, and industrial properties. 


  • M.S., Sustainable Development and Conservation Biology, University of Maryland, 2000
  • B.S., Biology, University of Notre Dame, 1997


Anderson EL, Turnham P, Griffin JR, Clarke CC. Consideration of the Aerosol Transmission of COVID-19 and Public Health. Risk Analysis 2020; 40(5): 902-907.

Anderson EL, Sheehan P J, Kalmes RM, Griffin JR. Assessment of health risk from historical use of cosmetic talcum powder. Risk Analysis 2016. doi:10.1111/risa.12664

Reiss R, Lewis G, Griffin J. An ecological risk assessment for triclosan in the terrestrial environment. Environ Toxicol Chem 2009; 28(7):1546-1556.

Reiss R, Griffin J. A probabilistic model for acute bystander exposure risk assessment for soil fumigants. Atmos Environ 2006; 40(19):3548-3560.

Reiss R, MacKay N, Habig C, Griffin J. An ecological risk assessment for Triclosan in lotic systems following discharge from wastewater treatment plants in the United States. Environ Toxicol Chem 2002; 21(11):2483-2492.


Richter RO, Griffin JR, Turnham P, Lau E. Release of naturally occurring arsenic via reductive dissolution at petroleum contaminated sites. AEHS Conference, San Diego, CA, March 2017.

Anderson E, Griffin J, Turnham P. Lessons learned from catastrophic releases to the environment: Catastrophic releases that impact human health can be chronic or acute. Poster presented at Reckoning with the Risk of Catastrophe - Deutsche Forschungsgemeinschaft (DFG) and the U.S. National Science Foundation (NSF) Research Conference, Washington, DC, October 2012.

Turnham P, Richter R, Griffin J. Estimating indoor air exposure concentrations of biodegradable VOCs using API's BioVapor Spreadsheet Model. Poster presented at Society for Risk Analysis Annual Meeting 2012, San Francisco, CA, December 2012.

Barabas N, Turnham P, Helfand J, Griffin J, Dunkin J. A tiered approach to fingerprinting dioxins — Distinguishing between an HCP manufacturing source and a barrel reconditioning facility. Presented at the 31st Annual Meeting in North America of the Society of Environmental Toxicology and Chemistry, Portland, OR, November 2010.

Turim J, Turnham P, Griffin J. Computing asbestos risk using mortality tables. Presented at the Society of Risk Analysis 23rd Annual Meeting, Baltimore, MD, 2003.

Dietz JM, Griffin J, Ballou J. Effect of reforestation and translocation on conservation of genetic diversity in wild golden lion tamarins. Presented at the Society for Conservation Biology, 1999 Annual Meeting, College Park, MD, June 17-21, 1999.

Prior Experience

Project Manager and GIS Programs Team Leader, Sciences International, Inc., 2005–2006

Senior Associate and GIS Programs Team Leader, Sciences International, Inc., 2004–2005

Associate, Sciences International, Inc., 2001–2004

Analyst, Sciences International, Inc., 2000–2001

Risk Assessment Specialist, Jellinek, Schwartz & Connelly, Inc., 1999–2000

Professional Affiliations

Society for Risk Analysis

International Society of Exposure Science

Project Experience

Provided support and technical analysis for litigation involving worker exposure to World Trade Center related contamination in lower Manhattan. Required the review, cataloguing, mapping, and analysis of thousands of pages of data related to potential exposures in dozens of buildings.

Identified, assembled, analyzed and mapped sampling data generated by multiple groups for a large petroleum release. The final database included over 500,000 samples. The database was utilized to evaluate potential exposures and risk to workers and nearby residents.

Evaluated the potential risks associated with coal ash landfills and storage ponds at eight facilities for a large utility company. The analysis utilized the groundwater monitoring data collected for compliance with the Coal Combustion Residuals (CCR) Rule. The evaluation considered concentrations measured in the monitoring wells, the likelihood of migration to offsite groundwater or surface water, possible exposure concentrations in offsite groundwater or surface water, the amount of contact with that groundwater or surface water by people and other environmental receptors, and the potential for toxicity of the detected chemicals at concentrations present in the environment.

Provided consulting support and analysis for several bankruptcies associated with asbestos liabilities. Work involved exposure assessment, risk assessment, and review of claimant medical and occupational histories. An evaluation of the epidemiology and regulatory history of asbestos was also conducted.

Assisted in the development of the PERFUM model, which was designed to estimate the potential for bystander risks during the application of soil fumigants. The model was subject to an EPA Scientific Advisory Board review and is currently being utilized by EPA in the soil fumigant risk assessments.

Provided support and technical analysis for litigation involving consumer exposure to talc products. Involved the design and completion of exposure simulation studies, as well as the risk assessment of these potential exposures.

Developed a site-specific human health risk assessment for an industrial site as part of Maryland’s Voluntary Cleanup Program. This assessment included the evaluation of soil, groundwater, sediment, and surface water exposures for a variety of receptor populations. The goal of the assessment was to aid in the development of the cleanup remedies necessary for the redevelopment of the site.

Evaluated vapor intrusion risks associated with a petroleum release at a large fuel storage facility. The analyses utilized both soil vapor and groundwater concentrations to predict indoor air concentrations across a large site.

Assisted in the development of soil screening levels that were used to evaluate the potential health risks associated with the demolition of homes and businesses necessary for a major development project. The results were presented at a court hearing and led to the ultimate approval of the demolition plans.

Developed and oversaw a systematic review and analysis of medical and exposure information for thousands of claimants involved in an asbestos-related litigation proceeding. The review process included the establishment of written guidelines, the implementation of a rigorous quality control process involving training sessions for reviewers, and oversight by a team of senior staff who provided guidance throughout the entire review.

Provided support and technical analysis for litigation involving exposure to DDT in indoor dust. The focus was on potential historical exposures and the impacts of past exposure on property values. The EPA World Trade Center dust screening value approach was utilized to demonstrate the de-minimus future risks associated with current levels of DDT.

Aided a group of potentially responsible parties (PRPs) at a Superfund site in determining their share of the anticipated cleanup costs. Review of historical documents, aerial photographs, spatial distribution of contaminants, and process chemistry were used to estimate the anticipated cleanup costs and our client’s potential responsibility. Dioxins and PCBs in sediments were the major contaminants of concern.

Provided support and technical review for litigation involving the use of roxarsone in poultry production. The main area of concern was exposure to arsenic in air and house dust from the spreading of poultry litter. Tasks involved the analysis of background levels of arsenic in soil and air and review of the plaintiffs’ expert reports.

Developed revised exposure estimates on behalf of a manufacturer involved in litigation claiming health effects from the spraying of malathion in a Medfly Eradication Program in Florida. Also aided the same client in litigation that claimed ecological impacts from the spraying of malathion in New York City to control mosquitoes.

Developed an indoor air risk assessment of a former industrial site at the request of the Arizona Department of the Environment. The assessment utilized vapor intrusion modeling and measurement data to evaluate the risks to current and future users of the site. This included the use of EPA’s Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (Supplemental Guidance).

Utilized GIS, air modeling data, and risk assessment methodologies to develop a population level risk assessment that examined the health impacts of a mid-western power plant’s emissions on the population of the Northeastern U.S.

Evaluated the future health impacts on a neighboring state associated with emissions from one of the largest producers of electricity in the United States using GIS, air modeling data, and risk assessment methodologies.

Evaluated and revised asbestos risk assessments performed by EPA for the Libby, Montana area as part of cost recovery and criminal litigation.

Analyzed underlying data, calculations, and results of the National Scale Air Toxics Assessment for a variety of industry groups. This assessment also included the evaluation and preparation of comments and corrections for the National Emissions Inventory on behalf of individual corporations and industry groups. Specifically, ethylene oxide and acrylonitrile emissions have been analyzed in detail.

Created a life table analysis that utilized cohort specific mortality data to predict the rates of mesothelioma and lung cancer in a cohort of asbestos exposed workers. This analysis included the evaluation of the Hodgson and Darnton, Berman and Crump, and Nicholson methodologies.

Evaluated the potential health impacts and risk reduction for the US population associated with the use of various formulations of biodiesel fuel in heavy duty diesel vehicles. The impact of the implementation of various diesel regulations was considered in evaluating the long-term benefits of the emissions reduction associated with biodiesel fuels.

Conducted air emissions modeling of coke ovens on behalf of EPA in order to evaluate the accuracy of the BLP and ISC models in estimating the dispersion of coke oven emissions from several facilities throughout the US.

Participated in the review of Reregistration Eligibility Documents for various agrochemicals on behalf of the agrochemical industry. In addition, provided research and analysis support for the registration of new pesticides regulated under the Federal Insecticide Fungicide and Rodenticide Act (FIFRA).

Prepared and submitted Premanufacture Notices (PMNs) for new chemical substances in compliance with the Toxic Substances Control Act on behalf of chemical manufacturing clients. The products registered have included glass coatings, paint additives, and friction product additives.

Evaluated the potential liability for a corn flour producer associated with the discovery of Starlink corn in their inventory. The analysis was used to support their insurance claim for removing all yellow corn products from the marketplace for a year.

Provided database and mapping support for a variety of litigation cases associated with Superfund sites. This support has included the evaluation of the adequacy of the data, the spatial distribution of impacts, and the appropriateness of proposed remedies.

Assessed the potential risks associated with community exposure to a former industrial site contaminated with chromium ore processing residue (COPR). Also evaluated the risk reduction capability of a proposed remedy for the site.



  • M.S., Sustainable Development and Conservation Biology, University of Maryland, 2000
  • B.S., Biology, University of Notre Dame, 1997