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Randall (Randy) W. Gentry, Ph.D., P.E.

My primary work includes Division management.  My research activities focus on using landscape characteristics and patterns to understand ecosystem sustainability.  This research studies the relationship between landscape characteristics and survey style measurements and observations.  Landscape indicators are used as measures of ecosystem condition, properly functioning condition and ecological values.  Past research activities have included: support for the Gulf and Alaskan Oil Spills, Western EMAP Landscape Program, research to support the use of oil-degrading bacteria to clean up oil in an environmentally acceptable manner, implemented a research program to determine the status and trends of the Nation’s rangeland ecosystems, and incineration testing of PCBs, in support of the PCB Transformer Fires Rule to study the thermal degradation products from dielectric fluids (example).

Biographical Information

Name: Randall (Randy) W. Gentry, Ph.D., P.E.
Title:   Division Director

Contact Info:

Environmental Sciences Division / Office of the Director
U.S. Environmental Protection Agency
U.S. Environmental Protection Agency
P.O. Box 93478
Las Vegas, Nevada 89193

Phone: 702-798-2104


  • Doctor of Philosophy in Civil Engineering, 1998, the University of Memphis
  • Master of Science in Civil Engineering, 1996, the University of Memphis
  • Bachelor of Science in Civil Engineering, 1991,  Memphis State University

Professional Experience

  • Director, Institute for a Secure and Sustainable Environment, University of Tennessee, 2007-2012
  • President and CEO, University of Tennessee Research Foundation, 2009-2011
  • Associate Professor, Civil & Environmental Engineering, University of Tennessee, August 2006 to 2012
  • Special Assistant to the Executive Vice-President, University of Tennessee, 2009
  • Water Resources Group Leader, Institute for a Secure and Sustainable Environment, University of Tennessee., 2006 - 2007
  • Interim Director, Institute for a Secure and Sustainable Environment, University of Tennessee, 2007

Select Awards and Honors:

  • 2011 NERL Teamwork Award, NERL EcoSummit Team
  • 2010 ORD Metal and Certificate for service in support of the Deepwater Horizion Oil Spill

Publications and Presentations (1999 - Present) / (These are from ORD Science Inventory) 

Select Publications:


Gentry, R.W. 2013. Efficacy of Fuzzy C-Means Cluster Analysis of Naturally Occurring Radioisotope Datasets for Improved Understanding of Basin-Wide Groundwater Quality Management Risks Under Climate ChangeBritish (TIP # ORD-004149, Journal Artricle) Journal of Environment and Climate Change. SCIENCEDOMAIN International, Valley Cottage, NY, 3(3):464-479, (2013). Published on 9/23/13
Gentry, R.W. 2011. Physical and Chemical Characterization of Groundwater Systems. Pp 113-126 in: M. Aral and S. Taylor (Ed.) Groundwater Quantity and Quality Management, ASCE Press, New York, NY


Gentry, R.W., McKay, L., Thonnard, N., Anderson, J.L, Larsen, D., Carmichael, J.K., and Solomon, K. 2006. Novel Techniques for Investigating Recharge to the Memphis Aquifer. American Water Works Association. 97pp
Gentry, R.W., McKay, L., Layton, A., and McCarthy, J. 2005. Development of Novel Tracer Techniques for Better Understanding of Karst Transport Characteristics and Surface Water Influences. pp 1-6 In: R. Walton (Ed.) Impacts of Global Climate Change, ASCE Press, New York, NY
Gentry, R.W. 2004. Using environmental tracers to verify and investigate conceptual models of highly localized aquitard leakage. pp 1-7 In: G. Sehlke, D.F. Hayes, and D.K. Stevens (Eds.) Critical Transitions in Water and Environmental Resources Management, ASCE Press, New York, NY

Gentry, R.W. 2004. Assessing ground water and surface water interaction through tracer observation. pp 1-7 In: G. Sehlke, D.F. Hayes, and D.K. Stevens (Eds.) Critical Transitions in Water and Environmental Resources Management, ASCE Press, New York, NY
Larsen, D., Gentry, R.W., Ivey, S., Solomon, D.K., and Harris, J. 2003. Groundwater leakage through a leaky confining unit beneath a municipal well field, Memphis, Tennessee, USA. In Schulz, H.D., and Hadeler, A., eds., Geochemical Processes in Soil and Groundwater, Wiley-VCH, Berlin, p. 51-64
Kupfer, J. A., Franklin, S. B., Pezeshki, S.R., Hanson, R.A, Scheff, T.L., Gentry, R.W. 2001. A comparison of hydrology and vegetation between a channelized stream and a nonchannelized stream in western Tennessee, Physical Geography, v22, n3, pp. 254-274

Select Presentations:


Gaddis, A., Drake, J., Evans, K.J., and Gentry, R.W. 2010. Evaluating Predictability in Nonlinear Climate Systems Using the Mount Pinatubo Eruption, Abstract NG31B-1325 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.

Koriala, S.R., Logan, J. and Gentry, R.W. 2010. Hydrologic Response to Climate Change in the Clinch River Watershed Using SWAT, Abstract H43F-1320 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.

Koirala, S.R. and Gentry, R.W. 2010. Hurst Analysis of Hydrologic and Water Quality Signals. World Environmental and Water Resources Congress 2010: Challenges of Change, May 16-20, 2010


Koirala, S.R. and Gentry, R.W. 2009. Using Wavelets to Evaluate Persistence of High Frequency Hydrologic and Hydrochemistry Signals, Eos Trans. AGU, 90(52), Fall Meet. Suppl., Abstract H51I-0908
Donat, R., Perfect, E., Gentry R., McKay, L. and Van den Berg, E. Modeling the Scale-Dependent Relationship between Effective and Slug Test-Determined Saturated Hydraulic Conductivities. 2008 GSA-SSSA-ASA-CSSA-GCAGS Joint Meeting, Houston, TX, October 5-9, 2008 

Franklin, S.B., Kupfer, J.A., Pezeshki, S.R., Gentry, R., and Smith, R.D. Complex Effects of Channelization and Leveeing on Western Tennessee Floodplain Forest Structure, Composition and Function. Floodplain Ecosystem Symposium: Integrating Science Into the Restoration and Management of Floodplain Ecosystems of the Southeast, Little Rock, AR, March 4-6, 2008

Gentry R.W., Using Hydrologic Tracers and Geochemistry to Assess Surface Water and Ground Water Interactions for Ecosystem Sustainability. 2008 China-US Workshop: Bioenergy Consequences for Global Environmental Change, Beijing, China, October 15-17, 2008


Gentry, R.W. 2007. Urgent Requirements for Developing a Secure and Sustainable Environment, U.S. – China Workshop on Environmental Aspects of Bioenergy Production and Sustainability, Knoxville, TN, September 11-14, 2007

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