Researcher Profile

Jackson School of Geosciences

Marcus Gary

Marcus Gary
Faculty Affiliate, Department of Geological Sciences, Jackson School of Geosciences

Email: mgary@edwardsaquifer.org
Office: GEO 2.104
Mailcode: C1100
Curriculum Vitae (pdf)

I'm a karst hydrogeologist who specializes in investigations that expand our understanding of karst processes, and study the implications that karst hydrogeology has on natural resource management. I received my Ph.D. in hydrogeology from the Jackson School of Geosciences at The University of Texas at Austin in 2009, and a B.S. degree from the same institution in 2001. My dissertation focused on defining the geological processes that formed one of the deepest underwater cave systems in the world, Sistema Zacaton. This multi-disciplinary research included studies utilizing geophysics, geomicrobiology, hydrology, field mapping, geochemistry, and numerous related topics. Most notably, Sistema Zacaton was explored by the DEPTHX autonomous underwater vehicle (AUV), also known as the Deep Phreatic Thermal Explorer, developed and tested with funding from NASA. The DEPTHX probe produced a detailed 3-D spatial dataset used to characterize this underwater cave system. I also worked for 8 years as a hydrologist for the U.S. Geological Survey, 4 years as a private environmental consultant, and is currently the Field Operations Supervisor for the Edwards Aquifer Authority in San Antonio, Texas. I have taught a class in Applied Karst Hydrogeology at the Jackson School of Geosciences since 2011, integrating research objectives of the Edwards Aquifer Authority with this class, with a strong emphasis on field hydrology. Prior to his career in geosciences, I worked as a commercial diver (A.S. in Marine Technology - College of Oceaneering, 1994), working for over 8 years in the offshore oil industry, conducting marine archeological surveys, managing hyperbaric medical facilities, exploring underwater caves, and recovering ICBMs for the U.S. military in the south Pacific.

Areas of Expertise

Karst Hydrogeology


Research Locations



Current Research Programs & Projects

Trinity-Edwards Inter-Formational Flow


Graduate Students

Jenna Kromann (Co-supervisor)
I am interested in studying the dynamics of surface water-groundwater interactions and karst hydrogeology. Currently, I am researching the Nueces River in Uvalde County, investigating the interaction between surface water and groundwater. Focusing on: estimating the amount of recharge into the Edwards Aquifer using innovative technologies, determining the controls on gains and losses in the river, and investigating the effects of gravel alluvium on aquifer recharge. Then combining collected data to develop a water balance for this river system and model.

Caroline C Hackett (Co-supervisor)


Undergraduate Students

Tim Eishen (2012)
Jeffery Watson (2013)
Tiffany Kocis (2013)
Catherine Rohan (2014)
Sam Lilliard (2015)
Kendall Yates (2016)


YearSemesterCourse
2017Spring GEO 377K Applied Karst Hydrogeology
2017Spring GEO 391K Applied Karst Hydrogeology
2016Spring GEO 377K Applied Karst Hydrogeology
2015Spring GEO 377K Applied Karst Hydrogeology
2015Spring GEO 391K Applied Karst Hydrogeology
2014Spring GEO 377K Applied Karst Hydrogeology
2014Spring GEO 391K Applied Karst Hydrogeology

Photos of research of the Sistema Zacaton karst area

The Edwards Aquifer Authority
Website of the EAA.

DEPTHX Project

DEPTHX blog

Karst Hydrogeology and Speleogenesis of Sistema Zacaton
Re-published dissertation of Marcus Gary, published by the Association of Mexican Cave Studies