
Your AC Bill Proves We Forgot About the Ground
No spam. Just Hang Dallas.
What this talk is about
The Hang Theory. A lecture series by Hang Dallas.
One speaker. One big idea. One good room.
Where · 2700 SWISS Event Space.
The title names the problem: we cool our buildings by brute force, burning energy to push heat out, while steady thermal energy sits beneath our feet. Dr. John Holbrook walks through what geothermal systems actually are, how water moving through subsurface rock can harvest heat from sedimentary basins, and why Texas sits on conditions that make ground-source energy viable now. The talk covers the mechanics of heat flow below grade and what it would take to tap it at scale.
How the night goes
Doors at 6:30 PM. Claim a seat, settle in.
We kick things off around 6:55 PM.
Dr. Holbrook takes the floor at 7:00 PM.
Questions from the room near 7:45 PM.
Then we linger. Meet the speaker, meet each other, around 8:00 PM.
Out by 8:30 PM.
Who's speaking

John Holbrook
John Holbrook is a Professor in the Department of Geological Sciences at Texas Christian University. He previously served as a Professor at both University of Texas at Arlington and Southeast Missouri State University, and has held adjunct/guest professor positions at Enugu State University, Nigeria; St Petersburg State University, Russia; University of Texas at Dallas; and Hebrew University, Jerusalem. His research interests are field oriented, focusing mostly on both modern and ancient fluvial-deltaic systems and physical stratigraphy. He is a ‘World’s Top 2% Scientist’ for 2020, 2021, and 2025 according to the Stanford/Elsevier ranking, and a highest-ranked (top 3%) scholar in his field and overall according to ResearchGate 2022-present. Current interests include controls on architecture and permeability trends in sediments, quantifying fundamental sedimentary processes at small and large scales, pathways to preservation of modern processes in the stratigraphic record, the origin of stratigraphic sequences, and tectonic and climatic impacts on rivers and deltas. He has worked directly in these areas in over 20 countries. He applies his research widely across petroleum, geothermal, and environmental issues, and is well published, well cited (<6400), and active professionally in each of these fields. He has thus far graduated 44 M.S. and four Ph.D. thesis students. He gained his B.S. at the University of Kentucky, his M.S. at the University of New Mexico, and his Ph.D. at Indiana University, all in Geology. He was PI for the NSF Research Coordination Network for research in geothermal energy from sedimentary basins. He has served on several committees at SEPM, GSA, and AAPG. He is a past member of GSA Council, past Chair of the GSA Sedimentary Geology Division, past Chair of the GSA Publications Committee, and is a GSA Fellow. He has served SEPM on SEPM Council and as President of Gulf Coast and Mid-Continent sections, and he teaches short courses and serves/chaired committees for AAPG. He is a licensed Professional Geologist and served as Vice Chair of the Board of Geologist Registration in Missouri. He works on numerous funded research projects globally and has sat proposal review panels for PRF, AAPG, NSF, and USGS. He was an AAPG Distinguished Lecturer in 2015/2016, teaches AAPG short courses in fluvial and sequence stratigraphy, and won the Madsen Award for Best Oral Presentation at the annual meeting (ACE) in 2019. He is an experienced expert witness, working in multiple Fortune-500 environmental litigations.
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2700 SWISS Event Space · Dallas, TX