Mary deFlaun, Ph.D., BCES

Mary deFlaun is a Senior Principal environmental microbiologist based in New Jersey with more than 30 years of experience remediating recalcitrant organics and metals, including monitored natural attenuation (MNA), enhanced in situ bioremediation (EISB), in situ chemical reduction (ISCR), and biostabilization of metals. She serves as a technical consultant and testifying expert for innovative remedial biotechnologies at Superfund Sites in the northeastern U.S. and across the country and manages Geosyntec's North East Region offices.

Mary deFlaun is a Senior Principal environmental microbiologist based in New Jersey with more than 30 years of experience remediating recalcitrant organics and metals, including monitored natural attenuation (MNA), enhanced in situ bioremediation (EISB), in situ chemical reduction (ISCR), and biostabilization of metals. She serves as a technical consultant and testifying expert for innovative remedial biotechnologies at Superfund Sites in the northeastern U.S. and across the country and manages Geosyntec's North East Region offices.


As a member of the Interstate Technology & Regulatory Council's (ITRC) BioDNAPL group, she was involved in drafting their technical and regulatory guidance, including "Bioremediation of Chlorinated Ethene DNAPL," and was a trainer for the guidance document.  Mary also develops and implements R&D programs related to the optimization of in situ hazardous waste treatment processes, including the development of an in situ arsenic biostabilization technology under the SERDP/ESTCP research and development program.

Mary has designed and conducted numerous bench-scale and pilot-scale treatability studies and has taken numerous innovative technologies to field-scale. Her experience also includes the development of bioreactors for the microbiological treatment of inorganic constituents such as perchlorate, nitrate, chromate, sulfate and arsenic. She serves on Geosyntec's Technical Analytical Team for SARS-CoV-2 detection services and has over 60 peer-reviewed publications.

Contact Mary deFlaun at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-609-895-1400.

Career Summary of Mary deFlaun, Ph.D., BCES

  • Specialties: Groundwater Assessment and Remediation; Specialized In Situ Treatment Technology; Litigation support; Vapor Intrusion; Brownfields Redevelopment Planning and Design
  • Practice Areas: Contaminated Site Assessment and Cleanup
  • Disciplines: Microbiology, Environmental Sciences
  • Education: Postdoctoral Fellow, Tufts University Medical School, Department of Molecular Biology and Microbiology, 1990; Ph.D., Oceanography, University of South Florida, 1987; M.S., Oceanography, University of Maine, 1982; B.S., Biology, Beloit College, 1978

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