St Thomas M LeDoux

St Thomas M LeDoux

Post-Master's Research Associate


St. Thomas LeDoux is a GIS technician for the Population Distribution and Dynamics research team - part of the Geographic Information Science and Technology group - at ORNL.  He currently works on various aspects of the Landscan HD project, which seeks to model global human population density by various methods of machine learning and pattern recognition from satellite imagery.  This work is funded primarily by the Bill and Melinda Gates Foundation, as part of their efforts to eradicate polio and other communicable deseases throughout the developing world.

Prior to his arrival at ORNL, St. Thomas earned his M.S. in Geology from the University of Tennessee, Knoxville, where he investigated the impacts of hydraulic fracturing and surface mining on groundwater quality using stable isotopes and other chemical tracers.  He also holds a B.S. in Anthropology from UTK, and his broader research interests include human geography, environmental science, chemical transport modeling, disaster mitigation, waste management, and political economy.



Ralph E. Powe Junior Faculty Enhancement Award: Oak Ridge National Laboratory (ORNL) and UTK; Szynkiewicz, A., LeDoux, S., Mayes, M.  2014.  “Characterizing groundwater pollution from hydraulic fracturing using environmental tracers."


Landscan HD: ORNL, CCSD, CSED, GIST, Population Distribution & Dynamics



LeDoux, S., Szynkiewicz, A., Faiia, A., Mayes, M., McKinney, M., and Dean, W. (2016).  Chemical and isotope compositions of shallow groundwater in areas impacted by hydraulic fracturing and surface mining in the Central Appalachian Basin, Eastern United States. Applied Geochemistry, vol. 71, 73-85.           


LeDoux, S., Szynkiewicz, A., Mayes, M., Faiia, A.  2014.  “Characterizing groundwater alteration by hydraulic fracturing using radionuclides and stable isotopes, Letcher County, KY.” Geological Society of America.

LeDoux, S. 2012. “Soil compaction at Bonnaroo Musicand Arts Festival, Manchester, TN.” Geological Society of America.

LeDoux, S. 2014. “Understanding the impacts of and interactions between hydraulic fracturing and surface mining.” East Tennessee Geological Society.

Misc. Guest Lectures:

LeDoux, S. 2014. “An overview of hydraulic fracturing.” Geology 455: Environmental Geology, EPS, UTK.

LeDoux, S. 2014. “Scientific uncertainty in anthropogenically modified contexts: coal mining and shale gas drilling.” Departmental “Brown Bag” Lecture Series, EPS, UTK.

LeDoux, S. 2014. “An introduction to the concept of sustainability.” Geology 203: Sustainability, EPS, UTK.

LeDoux, S. 2013. “Biodiversity and the history of extinction.” Geology 103: Earth’s Environments, EPS, UTK.

LeDoux, S. 2012. “Radicals, dissidents, and other non-traditional political movements.” Anthropology 250: Introduction to Global Studies, Dept. of Anthropology (ANTH), UTK.

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