Dr. Engle is a professor in the Department of Earth, Environmental and Resources Sciences who focuses on a broad range of applied topics including dryland hydrogeology, geochemistry and transport of deep basinal fluids, and multivariate data analysis/machine learning. He has more than 20 years of experience, working in private industry and in government prior to joining UTEP in 2019.

• Ph D in Hydrogeology, University of Nevada, Reno (2005)
• MS in Hydrogeology, University of Nevada, Reno (2003)
• BS in Geology and Environmental Chemistry, The Evergreen State College (1997)

• Compositional analysis and unconventional Permian Basin produced waters: A simple tool for predicting major ion composition SPE Production and Operations (in press), AG Nnanna, B Ogbuji, Mark Engle, R Amesquita.
• Compositional closure - Its origin lies not in mathematics but rather in nature itself Minerals 12 (2022), Nicholas E. Pingitore, Mark Engle.
• NSF Convergence Accelerator: Sustainable systems enabling food security in extreme environments and food deserts employing a convergence of food, energy, water and systems for societal impac (2021), Deidra R. Hodges, Mark Engle, Gregory S. Schober, Sreenath Chalil Madathil, Malynda A. Cappelle, X Cai, B O'Connor, V Finkenstadt, J McClurkin Moore.
• Coal elemental (compositional) data analysis with hierarchical clustering algorithms International Journal of Coal Geology 249 (2021), Na Xu, Chuanpeng Xu, Robert B. Finkelman, Mark Engle, Qing Li, Mengmeng Peng, Lizhi He, Bin Huang, Yuchen Yang.
• Insights on geochemical, isotopic, and volumetric compositions of produced water from hydraulically fractured Williston Basin Oil Wells Environmental Science & Technology 55 14 (2021), Tanya J. Gallegos, Colin Doolan, Rodney Caldwell, Mark Engle, Matthew Varonka, Justin Birdwell, Glenn Jolly, Tyler B. Coplen, Thomas Oliver.
• Least squares Springer (2021), Mark Engle.
• Machine Learning Can Assign Geologic Basin to Produced Water Samples Using Major Ion Geochemistry Natural Resources Research (2021), Jenna L. Shelton, Aaron M. Jubb, Samuel W. Saxe, Emil D. Attanasi, Alexei V. Milkov, Mark Engle, Philip A. Freeman, Christopher A. Shaffer, Madalyn S. Blondes.
• The future low-temperature geochemical data-scape as envisioned by the US geochemical community Computers & Geosciences 157 (2021), Susan L. Brantley, Tao Wen, Deborah A. Agarwal, Jeffrey G. Catalano, Paul A. Schroeder, Kerstin Lehnert, Charuleka Varadharajan, Julie Pett-Ridge, Mark Engle, Anthony M. Castronova, others.
• Least Mean Squares Springer (2021), Mark Engle.
• A review of U.S. Geological Survey work completed under the California Regional Groundwater Monitoring Program (RMP) Report submitted to the Western States Petroleum Association (2020), Mark Engle, Derek T. Scott.
• A Vision for the Future Low-Temperature Geochemical Data-scape EarthArXiv (2020), Susan L. Brantley, Tao Wen, Deb Agarwal, Jeff Catalano, Paul A. Schroeder, Kerstin Lehnert, Charuleka Varadharajan, Julie Pett-Ridge, Mark Engle, Anthony M. Castronova, others.
• Can we beneficially reuse produced water from oil and gas extraction in the U.S.? Science of the Total Environment 717 (2020), Bridget R. Scanlon, Robert C. Reedy, Pei Xu, Mark Engle, J.P. Nicot, David Yoxtheimer, Qian Yang, Svetlana Ikonnikova.
• Chemical Composition of Formation Water in Shale and Tight Reservoirs: A Basin‐Scale Perspective John Wiley & Sons, Inc. (2020), Yousif Kharaka, Kathleen Gans, Elisabeth Rowan, James Throdsen, Christopher Conaway, Madalyn Blondes, Mark Engle.
• Compositional analysis of formation water geochemistry and microbiology of commercial and carbon dioxide-rich wells in the southwestern United States US Geological Survey Scientific Investigations Report 2020–5037 (2020), Jenna L. Shelton, Robert S. Andrews, Denise M. Akob, Christina A. DeVera, Adam C. Mumford, Mark Engle, Michael R. Plampin, Sean T. Brennan.
• Direct trace element determination in oil and gas produced waters with inductively coupled plasma-optical emission spectrometry: Advantages of high-salinity tolerance Geostandards and Geoanalytical Research 44 (2020), Aaron M. Jubb, Mark Engle, Jessica M. Chenault, Madalyn S. Blondes, Cloelle G. Danforth, Colin Doolan, Tanya J. Gallegos, Dan Mueller, Jenna L. Shelton.
• Geochemical and geophysical indicators of oil and gas wastewater can trace potential exposure pathways following releases to surface waters Science of The Total Environment (2020), Isabelle M. Cozzarelli, Douglas B. Kent, Martin Briggs, Mark Engle, Adam Benthem, Katherine J. Skalak, Adam C. Mumford, Jeanne Jaeschke, Farag, A\"\ida, John W. Lane, others.
• Groundwater origin determination in historic chemical datasets through supervised compositional data analysis: Brines of the Permian Basin, USA Springer (in press), Mark Engle, Julien A. Chaput.
• Origin and geochemistry of formation waters from the lower Eagle Ford Group, Gulf Coast Basin, south central Texas Chemical Geology 550 (2020), Mark Engle, Colin A. Doolan, Janet A. Pitman, Matthew S. Varonka, Jessica Chenault, William H. Orem, Peter B. McMahon, Aaron M. Jubb.
• Utica Shale Play Oil and Gas Brines: Geochemistry and Factors Influencing Wastewater Management Environmental Science & Technology 54 21 (2020), Madalyn S. Blondes, Jenna L. Shelton, Mark Engle, Jason P. Trembly, Colin A. Doolan, Aaron M. Jubb, Jessica C. Chenault, Elisabeth L. Rowan, Ralph J. Haefner, Brian E. Mailot.
• Weighted Symmetric Pivot Coordinates for Compositional Data with Geochemical Applications Mathematical Geosciences (2020), Karel Hron, Mark Engle, Peter Filzmoser, Fiserova, Eva.
• Considerations in the application of machine learning to aqueous geochemistry: Origin of produced waters in the northern U.S. Gulf Coast Basin Applied Computing and Geosciences 3-4 (2019), Mark Engle, Benjamin Brunner.
• Spatial variability of produced-water quality and alternative-source water analysis applied to the Permian Basin, USA Hydrogeology Journal (2019), Binod K. Chaudhary, Robert Sabie, Mark A. Engle, Pei Xu, Spencer Willman, Kenneth C. Carroll.
• Accuracy of methods for reporting inorganic element concentrations and radioactivity in oil and gas wastewaters from the Appalachian Basin, US based on an inter-laboratory comparison Environmental Science: Processes & Impacts 21 2 (2019), Travis L. Tasker, William D. Burgos, Moses A. Ajemigbitse, Nancy E. Lauer, Alen V. Gusa, Maksat Kuatbek, Dustin May, Joshua D. Landis, Daniel S. Alessi, Amanda M. Johnsen, J M. Kaste, K L. Headrick, F. D. H. Wilke, M McNeal, Mark Engle, A. M. Jubb, R. D. Vidic, A. Vengosh, N. R. Warner.
• Self-organizing maps for compositional data: coal combustion products of a Wyoming power plant Stochastic Environmental Research and Risk Assessment 33 3 (2019), Josep M. Martin-Fernandez, Mark Engle, Leslie F. Ruppert, Ricardo Olea.
• Assessing rare earth element concentrations in geothermal and oil and gas produced waters: A potential domestic source of strategic mineral commodities Univ. of Wyoming, Laramie, WY (United States) (2018), Scott Quillinan, Charles Nye, Mark Engle, Timothy T. Bartos, Ghanashyam Neupane, Jonathan Brant, Davin Bagdonas, Travis McLing, J F. McLaughlin, Erin Phillips, others.
• Gas emissions, tars, and secondary minerals at the Ruth Mullins and Tiptop coal mine fires International Journal of Coal Geology 195 (2018), Jennifer M. O'Keefe, Erika R. Neace, Max L. Hammond, James C. Hower, Mark Engle, Joseph East, Nicholas J. Geboy, Ricardo A. Olea, Kevin R. Henke, Gregory C. Copley, others.
• Hydrogeochemical controls on brackish groundwater and its suitability for use in hydraulic fracturing: The Dockum Aquifer, Midland Basin, Texas Environmental Geosciences 25 2 (2018), Francisco R. Reyes, Mark Engle, Lixin Jin, Michael A. Jacobs, Jasper G. Konter.
• The isometric log-ratio (ilr)-ion plot: A proposed alternative to the Piper diagram Journal of Geochemical Exploration 190 (2018), Jenna L. Shelton, Mark Engle, Antonella Buccianti, Madalyn S. Blondes.
• Assessment of water and proppant quantities associated with petroleum production from the Bakken and Three Forks Formations, Williston Basin Province, Montana and North Dakota, 2016 US Geological Survey (2017), Seth S. Haines, Brian A. Varela, Sarah J. Hawkins, Nicholas J. Gianoutsos, Joanna N. Thamke, Mark Engle, Marilyn E. Tennyson, Christopher J. Schenk, Stephanie B. Gaswirth, Kristen R. Marra, others.
• Characterization of organic matter in wastewater from unconventional oil and gas production 253 (2017), William Orem, Matthew Varonka, Anne Bates, Tiffani Schell, Mark Engle.
• Methane and benzene in drinking-water wells overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas Environmental Science \& Technology 51 12 (2017), Peter B. McMahon, Jeannie R. Barlow, Mark Engle, Kenneth Belitz, Patricia B. Ging, Andrew G. Hunt, Bryant C. Jurgens, Yousif K. Kharaka, Roland W. Tollett, Timothy M. Kresse.
• Environmental signatures and effects of an oil and gas wastewater spill in the Williston Basin, North Dakota Science of The Total Environment 579 (2017), IM Cozzarelli, KJ Skalak, DB Kent, Mark Engle, A Benthem, AC Mumford, K Haase, A Farag, D Harper, SC Nagel, others.

• Production of minerals from oil and gas produced waters: Current state of the science (2020), Volume virtual meetings, Mark Engle, Stephanie Ray.
• Sourcing and characterizing geochemical changes from unpermitted produced water dumping, Permian Basin, USA (2020), Volume virtual meeting, Mark Engle, Denise Akob, Kit Conaway, Douglas Kent, Terry Gregston, Isabelle Cozzarelli.
• Strategic minerals - are they hiding in plain sight? (2020), Volume virtual meeting, Nicholas E. Pingitore, Antonio Arribas, Mark Engle, Philip C. Goodell, James Kubicki.
• Sourcing and characterizing geochemical changes from unpermitted produced water dumping, Permian Basin, USA (2020), Volume virtual, Mark Engle.
• Effects of Permian Basin oil and gas wastewater dumping on soil microbial communities (2020), Volume Montreal, Canada, Mitra Kashani, Mark Engle, Douglas Kent, Terry Gregston, Isabelle Cozzarelli, William Orem, Adam Mumford, Denise Akob.
• Sourcing and characterizing geochemical changes from unpermitted produced water dumping, Permian Basin, USA (2020), Volume Montreal, Canada, Mark Engle, Denise Akob, Kit Conaway, Douglas Kent, Terry Gregston, Isabelle Cozzarelli.
• Mineral extraction potential from produced waters - State of the science (2020), Volume virtual seminar, Mark Engle.
• Sourcing and characterizing geochemical changes from unpermitted produced water dumping, Permian Basin, USA (2020), Volume Midland, Texas, Mark Engle.
• Mineral extraction potential from produced waters - State of the science (2020), Volume Webinar, Mark Engle.
• Hydrogen-bonding networks in highly saline brines from the Lower Eagle Ford Group: Implications for wettability of continuous reservoirs (2019), Volume San Francisco, California, Aaron Jubb, Mark Engle.
• Organic substances in wastewater from continuous oil and gas production in the Permian Basin (2019), Volume San Francisco, California, William Orem, Matthew Varonka, Tiffani Schell, Isabelle Cozzarelli, Denise Akob, Mark Engle, Terry Gregston.

• MRI Acquisition of inductively coupled plasma-optical emissionspectrometer for research and education uses in water, energy, and environmental sciences
• Space and Seed Grant Proposal to Establish a “One Water” Cluster in the Interdisciplinary Research Building, University of Texas at El Paso