Ryan Fimmen, Ph.D.

Ryan Fimmen is a Principal Scientist based in Ohio with more than 12 years of experience in the remediation of soils, sediments, and groundwater and in contaminant fate and transformation.

Ryan Fimmen is a Principal Scientist based in Ohio with more than 12 years of experience in the remediation of soils, sediments, and groundwater and in contaminant fate and transformation.


Ryan is an authority in research and development of advanced environmental remedial technologies and environmental technology evaluation, verification, and certification. He has also been called upon to provide expertise in litigation support and expert report preparation.

With experience including consulting to private sector and government clients, Ryan helps clients coordinate effective field-scale investigations, laboratory analyses, data reduction/interpretation, and prepare high-quality reports and technical memoranda for submission to clients, state and federal regulators, and publication in peer-reviewed journals.

Ryan's work with coal combustion residuals (CCR) management has included developing a decision framework document for the Electric Power Research Institute (EPRI) for the evaluation of the application of monitored natural attenuation (MNA) at sites with CCR-impacted groundwater. The framework guides the decision-making process to help determine the necessary level of justification for MNA, including defining the geochemical processes governing the attenuation and sequestration of the site-specific constituents, hydrogeologic setting, and long-term stability of MNA implementation. 

An Ohio Voluntary Action Program (VAP)-Certified Professional, Ryan has conducted numerous site assessments under the program at manufacturing, industrial, and underground storage tanks (UST) sites, among others.  He also has experience managing sites through the RCRA Corrective Action process, including site delineation, preparation of Corrective Measures Studies, remedy implementation, and community engagement.

Contact Ryan Fimmen at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-614-468-0419.

Career Summary of Ryan Fimmen, Ph.D.

  • Specialties: Geochemistry, Coal combustion products, RCRA facilities investigation, Groundwater remediation/sediment restoration, Geochemical systems and modeling
  • Practice Areas: Contaminated Site Assessment and Cleanup, Water and Natural Resources, Geotechnical and Geoenvironmental Engineering
  • Disciplines: Chemistry, Geochemistry
  • Education: Ph.D., Geochemistry, Duke University, Durham, North Carolina, 2004; M.S., Chemistry, University of Wisconsin, Madison, Wisconsin, 1998; B.A., Chemistry, Carleton College, Northfield, Minnesota, 1995
  • Registration: Ohio EPA Certified Professional No. 375

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