Current Spacecraft Involvement

SHARAD radar sounder instrument on the Mars Reconnaissance Orbiter, Co-I

Current Graduate Students

Student Collaborations/Advising

• Nicole Bardabelias (M.S., Geosciences)
• Brandon Tober (Ph.D., Geosciences)

Former Students

• Stefano Nerozzi, 2019, Ph.D., UT Austin
• Eric Peterson, 2018, Ph.D., UT Austin
• Dan Lalich, 2017, Ph.D., UT Austin
• Cassie Stuurman, 2017, M.S., UT Austin
• Katherine Shover, 2016, M.S., UT Austin

Current Postdocs

• Stefano Nerozzi

Former Postdocs

• Eric Petersen

Based on Google Scholar and NASA ADS: NASA ADS Author search: J. W. Holt

Recent refereed publications: Years 2019 through June 2025

Meng, T. M., Tober, B. S., Aguilar, R. J., Daniel, M. F., Jacobo-Bojórquez, R. A., Nerozzi, S., & Holt, J. W. 2025, Journal of Geophysical Research (Earth Surface). Effects of Rock Glacier Dynamics on Surface Morphology and Deformation

Pritchard, Hamish D., Peter T. Fretwell, Alice C. Fremand, Julien A. Bodart, James D. Kirkham, Alan Aitken, Jonathan Bamber, Robin Bell, Cesidio Bianchi, Robert G. Bingham, Donald D. Blankenship, Gino Casassa, Knut Christianson, Howard Conway, Hugh F. J. Corr, Xiangbin Cui, Detlef Damaske, Volkmar Damm, Boris Dorschel, Reinhard Drews, Graeme Eagles, Olaf Eisen, Hannes Eisermann, Fausto Ferraccioli, Elena Field, René Forsberg, Steven Franke, Vikram Goel, Siva Prasad Gogineni, Jamin Greenbaum, Benjamin Hills, Richard C. A. Hindmarsh, Andrew O. Hoffman, Nicholas Holschuh, John W. Holt, Angelika Humbert, Robert W. Jacobel, Daniela Jansen, Adrian Jenkins, Wilfried Jokat, Lenneke Jong, Tom A. Jordan, Edward C. King, Jack Kohler, William Krabill, Joséphine Maton, Mette Kusk Gillespie, Kirsty Langley, Joohan Lee, German Leitchenkov, Cartlon Leuschen, Bruce Luyendyk, Joseph A. MacGregor, Emma MacKie, Geir Moholdt, Kenichi Matsuoka, Mathieu Morlighem, Jérémie Mouginot, Frank O. Nitsche, Ole A. Nost, John Paden, Frank Pattyn, Sergey Popov, Eric Rignot, David M. Rippin, Andrés Rivera, Jason L. Roberts, Neil Ross, Antonia Ruppel, Dustin M. Schroeder, Martin J. Siegert, Andrew M. Smith, Daniel Steinhage, Michael Studinger, Bo Sun, Ignazio Tabacco, Kirsty J. Tinto, Stefano Urbini, David G. Vaughan, Douglas S. Wilson, Duncan A. Young & Achille Zirizzotti 2025, Sci Data. Bedmap3 updated ice bed, surface and thickness gridded datasets for Antarctica

Foss, Frederick J., Putzig, Nathaniel E., Campbell, Bruce A., Levin, Stewart A., Perry, Matthew R., Holt, John W., Christoffersen, Michael S., Smith, Isaac B., Morgan, Gareth A., & Russell, Aaron T. 2024, Icarus. Producing 3D radargrams from orbital radar sounding data at Mars: History, results, methods, lessons and plans

Kuehn, Tyler, Holt, John W., Johnson, Roy, & Meng, Tyler 2024, Journal of Geophysical Research (Earth Surface). Active Seismic Refraction, Reflection, and Surface-Wave Surveys in Thick Debris-Covered Glacial Environments

Voigt, J. R. C., Hamilton, C. W., Steinbrügge, G., Christoffersen, M. S., Nerozzi, S., Kerber, L., Holt, J. W., Carter, L. M. 2023, Journal of Geophysical Research: Planets. Revealing Elysium Planitia's young geologic history: Constraints on lava emplacement, areas, and volumes

Tober, B. S., Holt, J. W., Christoffersen, M. S., Truffer, M., Larsen, C. F., Brinkerhoff, D. J., & Mooneyham, S. A. 2023, Journal of Geophysical Research (Earth Surface). Comprehensive Radar Mapping of Malaspina Glacier (Sít' Tlein), Alaska—The World's Largest Piedmont Glacier—Reveals Potential for Instability

Meng, T., Petersen, E. I., Holt, J. W. 2022, Journal of Galaciology Rock glacier composition and structure from radio wave speed analysis with dipping reflector correction

Nerozzi, Stefano, Ortiz, Maya R., & Holt, John W. 2022, Icarus. The north polar basal unit of Mars: An Amazonian record of surface processes and climate events

Petersen, Eric I. & Holt, John W. 2022, IEEE Transactions on Geoscience and Remote Sensing. Surface Roughness Prevents Radar Penetration of Some Martian Debris-Covered Glaciers

Putzig, Nathaniel E., Foss, Frederick J., Campbell, Bruce A., Holt, John W., Perry, Matthew R., Smith, Isaac B., Russell, Aaron T., Nerozzi, Stefano, Christoffersen, Michael S., Mueller, Isabella H., & Sava, Paul C. 2022, The Planetary Science Journal. New Views of the Internal Structure of Planum Boreum from Enhanced 3D Imaging of Mars Reconnaissance Orbiter Shallow Radar Data

Whitehead, T. R., Lim, Y., & Holt, J. W. 2021, Physical Review Letters. Global Microscopic Description of Nucleon-Nucleus Scattering with Quantified Uncertainties

Smith, I. B., Lalich, D. E., Rezza, C., Horgan, B. H. N., Whitten, J. L., Nerozzi, S., & Holt, J. W. 2021, Geophysical Research Letters. A Solid Interpretation of Bright Radar Reflectors Under the Mars South Polar Ice

Loso, Michael G., Larsen, Christopher F., Tober, Brandon S., Christoffersen, Michael, Fahnestock, Mark, Holt, John W., & Truffer, Martin 2021, Geomorphology. Quo vadis, Alsek? Climate-driven glacier retreat may change the course of a major river outlet in southern Alaska

MacGregor, Joseph A., Boisvert, Linette N., Medley, Brooke, Petty, Alek A., Harbeck, Jeremy P., Bell, Robin E., Blair, J. Bryan, Blanchard-Wrigglesworth, Edward, Buckley, Ellen M., Christoffersen, Michael S., Cochran, James R., Csathó, Beáta M., De Marco, Eugenia L., Dominguez, RoseAnne T., Fahnestock, Mark A., Farrell, Sinéad L., Gogineni, S. Prasad, Greenbaum, Jamin S., Hansen, Christy M., Hofton, Michelle A., Holt, John W., Jezek, Kenneth C., Koenig, Lora S., Kurtz, Nathan T., Kwok, Ronald, Larsen, Christopher F., Leuschen, Carlton J., Locke, Caitlin D., Manizade, Serdar S., Martin, Seelye, Neumann, Thomas A., Nowicki, Sophie M. J., Paden, John D., Richter-Menge, Jacqueline A., Rignot, Eric J., Rodríguez-Morales, Fernando, Siegfried, Matthew R., Smith, Benjamin E., Sonntag, John G., Studinger, Michael, Tinto, Kirsty J., Truffer, Martin, Wagner, Thomas P., Woods, John E., Young, Duncan A., & Yungel, James K. 2021, Reviews of Geophysics. The Scientific Legacy of NASA's Operation IceBridge

Levy, Joseph S., Fassett, Caleb I., Holt, John W., Parsons, Reid, Cipolli, Will, Goudge, Timothy A., Tebolt, Michelle, Kuentz, Lily, Johnson, Jessica, Ishraque, Fairuz, Cvijanovich, Bronson, & Armstrong, Ian 2021, Proceedings of the National Academy of Science. Surface boulder banding indicates Martian debris-covered glaciers formed over multiple glaciations

Whitehead, T. R., Lim, Y., & Holt, J. W. 2020, Physical Review C. Neutron elastic scattering on calcium isotopes from chiral nuclear optical potentials

Calvin, W. M., Putzig, N. E., Dundas, C. M., Bramson, A. M., Horgan, B. H. N., Seelos, K. D., Sizemore, H. G., Ehlmann, B. L., Morgan, G. A., Holt, J. W., Murchie, S. L., Patterson, G. W. 2021, The Planetary Science Journal The Mars Orbiter for Resources, Ices, and Environments (MORIE) Science Goals and Instrument Trades in Radar, Imaging, and Spectroscopy

Ojha, L., Karimi, S., Buffo, J., Nerozzi, S., Holt, J. W., Smrekar, S., Chevrier, V. 2021, Geophysical Research Letters Martian Mantle Heat Flow Estimate From the Lack of Lithospheric Flexure in the South Pole of Mars: Implications for Planetary Evolution and Basal Melting

Cook, Claire W., Bramson, Ali M., Byrne, Shane, Holt, John W., Christoffersen, Michael S., Viola, Donna, Dundas, Colin M., & Goudge, Timothy A. 2020, Icarus. Sparse subsurface radar reflectors in Hellas Planitia, Mars

Smith, Isaac B., Hayne, Paul O., Byrne, Shane, Becerra, Patricio, Kahre, Melinda, Calvin, Wendy, Hvidberg, Christine, Milkovich, Sarah, Buhler, Peter, Landis, Margaret, Horgan, Briony, Kleinböhl, Armin, Perry, Matthew R., Obbard, Rachel, Stern, Jennifer, Piqueux, Sylvain, Thomas, Nicolas, Zacny, Kris, Carter, Lynn, Edgar, Lauren, Emmett, Jeremy, Navarro, Thomas, Hanley, Jennifer, Koutnik, Michelle, Putzig, Nathaniel, Henderson, Bryana L., Holt, John W., Ehlmann, Bethany, Parra, Sergio, Lalich, Daniel, Hansen, Candice, Hecht, Michael, Banfield, Don, Herkenhoff, Ken, Paige, David A., Skidmore, Mark, Staehle, Robert L., & Siegler, Matthew 2020, Planetary and Space Science. The Holy Grail: A road map for unlocking the climate record stored within Mars' polar layered deposits

Petersen, Eric Ivan, Levy, Joseph S., Holt, John W., & Stuurman, Cassie M. 2020, Journal of Glaciology. New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure

Lalich, D. E., Holt, J. W., & Smith, I. B. 2019, Journal of Geophysical Research (Planets). Radar Reflectivity as a Proxy for the Dust Content of Individual Layers in the Martian North Polar Layered Deposits

Nerozzi, S. & Holt, J. W. 2019, Geophysical Research Letters. Buried Ice and Sand Caps at the North Pole of Mars: Revealing a Record of Climate Change in the Cavi Unit With SHARAD

Spikes, Kyle T., Tisato, Nicola, Hess, Thomas E., & Holt, John W. 2019, Geophysics. Comparison of geophone and surface-deployed distributed acoustic sensing seismic data

• Snow4Flow: Studying Glaciers From Arizona - January 24, 2025
• Measuring Glacier Ice and Its Impact on Sea Level Rise - October 11, 2024
• In High Mountain Alaska, a Glacier’s Deep Secret Is Revealed at Last - October 8, 2024
• Studying Arctic Glaciers with Airborne Radar: UArizona Project Attracts $30M from NASA - June 10, 2024
• 3D Radar Scan Provides Clues About Threats to Iconic Alaskan Glacier - March 15, 2023
• Mapping Rock Glaciers to Understand Their Future on Earth and Mars - November 16, 2022
• Linking Glaciers on Earth to the Climate on Mars - April 30, 2021
• Mapping the Moon and Worlds Beyond - July 16, 2019
• UA Study Suggests Possibility of Recent Underground Volcanism on Mars - February 14, 2019

LPL Evening Lecture

• The Slow, the Fast, and the Buried: Probing Glaciers on Earth and Mars - October 10, 2018