Planetary Geology, Geophys & Geochem Lab

Barbara A Cohen


Barbara A Cohen's Contact Card & Information.
Phone: 301.614.6803
Org Code: 690
Mail Code 690
Greenbelt, MD 20771

Missions & Projects

Brief Bio

Dr. Barbara Cohen is a planetary scientist at NASA Goddard Space Flight Center. Originally from upstate New York, Dr. Cohen earned her BS in Geology from the State University of New York at Stony Brook and her PhD in Planetary Science from the University of Arizona. Her main scientific interests are in geochronology and geochemistry of planetary samples from the Moon, Mars and asteroids. She is a Principal Investigator on multiple NASA research and space flight projects, including Lunar Flashlight, a lunar cubesat mission, and PITMS, a mass spectrometer manifested aboard the Astrobotic Peregrine lander for a lunar surface mission. She has been a member of the science teams operating the Mars rovers Spirit, Opportunity, and Curiosity, and Perseverance. She is the PI for the Mid-Atlantic Noble Gas Research Laboratory (MNGRL) and is developing a flight version of her noble-gas geochronology technique, the Potassium-Argon Laser Experiment (KArLE), for use on future planetary landers and rovers. Barbara serves as a subject-matter expert to human exploration missions, including serving as the Artemis IV Project Scientist. She participated in the Antarctic Search for Meteorites (ANSMET) in four seasons, where she helped recovered more than a thousand pristine samples for the US collection. Asteroid 6816 Barbcohen is named for her.

Research Interests

Mission Science, Operations, and Leadership

Solar System: Planetary Geology

  • Principal Investigator, PROSPECT Ion-Trap Mass Spectrometer (PITMS) instrument on CLPS delivery
  • Co-Investigator, Volatiles Investigating Polar Exploration Rover (VIPER)
  • Deputy Principal Investigator, Heimdall instrument on CLPS delivery
  • Co-Investigator, SAMPLR and PROSPECT instruments on CLPS deliveries
  • Principal investigator, Lunar Flashlight
  • Associate Project Scientist, Lunar Reconnaissance Orbiter
  • Sample Return Participating Scientist, Mars 2020
  • Participating Scientist, Mars Science Laboratory
  • Associate Principal Investigator, Mars Exploration Rovers

Human Exploration Achieving Science

Solar System: Planetary Geology

  • Artemis Internal Science Team, Sample Integrity Lead
  • Project Scientist for Artemis IV mission

Geochronology of Solar System materials

Solar System: Planetary Geology

Principal Investigator, Mid-Atlantic Noble Gas Research Laboratory (MNGRL)

  • Geochronology and noble-gas measurements of planetary materials, including lunar rocks, meteorites, and impact crater materials
  • Development of in situ techniques for geochronology on planetary lander or rover missions


AST, Planetary Science

NASA Goddard Space Flight Center - Greenbelt MD

January 2017 - Present

AST, Planetary Science

NASA Marshall Space Flight Center - Huntsville AL

May 2008 - January 2017

  • Project Scientist for the International Lunar Network and Robotic Lunar Lander projects
  • Program Scientist for the Lunar Precursor Robotics Program
  • Supported human and robotic exploration spaceflight planning, analog missions, and Strategic Knowledge Gap development

Research Assistant Professor

University of New Mexico - Albuquerque NM

November 2003 - May 2008

  • Principal investigator in the Institute of Meteoritics

Postdoctoral Research Associate

University of Hawaii - Honolulu HI

October 2001 - July 2003

  • Postdoctoral work on meteorites with Dr. Klaus Keil

Postdoctoral Research Associate

University of Tennessee - Knoxville TN

April 2000 - September 2001

  • Postdoctoral research on lunar samples with Dr. Larry Taylor


PhD, 2000

University of Arizona

Planetary Science

Advisor: Tim Swindle

BS, 1993

State University of New York at Stony Brook

Geological Sciences

Advisor: Dan Davis

Professional Societies

American Geophysical Union, Planetary Science Division

Section Secretary, 2015-2016; Fall Meeting Organizing Committee, 2015-2017; Prize Committee 2018-2020

1993 - Present

Meteoritical Society

Barringer Medal Committee, 2011-2014; Chair, Barringer Medal Committee, 2014

1994 - Present

American Astronomical Society, Division for Planetary Sciences

Prize Committee, 2018-9

1994 - Present

Geological Society of America

1998 - Present

Association for Women in Science

2000 - Present

Phi Beta Kappa

1992 - Present

Professional Service

  • Chair, Extraterrestrial Materials Analysis Group (ExMAG), 2020-2023
  • Chair, Contamination and Research Integrity (CaRI) Team, 2020-2022
  • Co-Chair, Artemis III Science Definition Team, 2020
  • Vice Chair, Lunar Exploration Analysis Group (LEAG), 2019-2020
  • Executive Committee, Mars Exploration Program Analysis Group (MEPAG), 2019-2020
  • Member, GSFC Science Director's Committee (SDC), 2018-19
  • Member, GSFC Diversity and Inclusiveness Committee, 2018-19
  • Member, Committee on the Review of Progress Toward Implementing the Decadal Survey Vision and Voyages for Planetary Science (planetary science mid-term review), 2017-18
  • Scientific Organizing Committee, Planetary Sciences Division, Fall AGU meeting, 2015-2017
  • Scientific Organizing Committee, Low Cost Planetary Missions conference, 2017
  • Executive Committee for community review of the Europa lander SDT report, 2017
  • Associate Editor, Geosciences journal, 2016-2019
  • Member, Mars International Collaboration Science Analysis Group (MIC-SAG) , 2016-17
  • Scientific Organizing Committee, International Workshop on Planetary Instruments, 2016
  • Secretary, Planetary Sciences Section of the American Geophysical Union (AGU), 2015-2016
  • Chair, Barringer Medal Committee for the Meteoritical Society, 2014
  • Member, Meteorite Working Group, 2012-2014
  • Member, Independent Assessment Team for Mars 2020 mission Science Definition Team, 2012
  • Member, Lunar Exploration and Analysis Group (LEAG) Special Analysis Team (SAT) on an Earth-Moon L2 Research Facility, 2012
  • Scientific Organizing Committee, 3rd Conference on Terrestrial Mars Analogues, 2012
  • Member, Barringer Medal Committee for the Meteoritical Society, 2011-2013
  • Member, Exploration NEA User Team (NUT) and Small Bodies Assessment Group (SBAG) Strategic Knowledge Gap Definition Team, 2011-2012
  • Member, Visions and Voyages - Planetary Sciences Decadal Survey, Inner Planets Panel, 2009-2010
  • Science team, NASA Desert-RATS, science backroom operations and planning, 2009 - 2011
  • Co-Convener, Airless Body Lander session, International Planetary Probes Workshop 7, Barcelona, Spain, 2010
  • Scientific Organizing Committee: LRO Targeting Workshop, NASA Lunar Science Forum, AAS Division for Planetary Science Annual Meeting, and Lunar Geophysics Workshop, 2009
  • Member, Optimizing Science and Exploration Working Group (OSEWG), 2008-2011
  • Co-Chair, Science Definition Team for the International Lunar Network (ILN) mission, 2008
  • Scientific Organizing Committee, Workshop on the Early Solar System Impact Bombardment, Houston TX, 2008
  • Convener, Special Session, Planetary Pummeling: Cataclysmic Bombardment of the Solar System as Catastrophe, Catalyst, Cauldron, and Crucible, GSA Annual Meeting, 2008
  • NRC/NASA Committee on the Scientific Context for the Exploration of the Moon, 2005-2007
  • CAPTEM Lunar Science Subcommittee, 2005-2006
  • Curation and Analysis Planning Team for Extraterrestrial Materials (CAPTEM), 2003-2005
  • Antarctic Search for Meteorites (ANSMET) team, 2003-04, 2006-07, 2013-14, 2017-18
  • Lunar and Planetary Science Conference Program Committee, 2002-2005
  • Meteoritical Society Program Committee, 2001
  • Convener, Special Session, Early lunar cratering and impact chronology, Lunar and Planetary Science Conference, 2001
  • Review panelist: NASA GRAIL and Lunar Reconnaissance Orbiter Participating Scientist Programs, NASA Lunar Sortie Science Opportunities, NASA Moon and Mars Analog Mission Activities, NASA Cosmochemistry, NASA Planetary Geology and Geophysics, NASA Emerging Worlds, NASA Solar System Workings, NASA Astrobiology Institute, NASA Mars Fundamental Research Program (panel chair), Mars Data Analysis Program (panel chair), NASA Planetary Data Archiving and Research Tools (panel chair), multiple external reviews


  • NASA Group Achievement Award for the Contamination and Research Integrity (CaRI) Team, 2023
  • Group Achievement Award for the Artemis Moon to Mars Objectives Development Team, 2023
  • Fellow of the Meteoritical Society, 2018
  • Solar System Exploration Research Virtual Institite (SSERVI) Coradini Mid-Career Award, 2018
  • NASA Ames Honor Award for FINESSE/SSERVI team, 2017
  • NASA Group Achievement Award for the Mojave Volatiles Prospector Team, 2015
  • NASA Group Achievement Award for work with Science Web Chats, 2015
  • NASA Group Achievement Award for Mars Exploration Rover Science and Operations, 2014
  • NASA Group Achievement Award for the Lunar Mapping and Modeling Project (LMMP), 2013
  • Antarctic Service Medal, 2012
  • NASA Silver Achievement Medal for the Robotic Lunar Lander team, 2012
  • NASA Group Achievement award for How to Protect and Preserve the Historic and Scientific Value of U.S. Government Lunar Artifacts, 2012
  • NASA Group Achievement Award for MER Extended Operations, 2008 and 2011
  • NASA Sagan/Haskin Early Career Fellowship recipient, 2007
  • Asteroid 6816 Barbcohen named, 2006
  • National Research Council Postdoctoral Fellowship (declined), 2003
  • Honorable mention, Best Student Paper, Meteoritical and Geochemical Societies, 2002
  • NASA Space Grant Fellowship, 1997-1999
  • NASA Graduate Student Research Program Fellowship, 1994-1997
  • University of Arizona Graduate College Fellowship, 1993
  • SUNY Stony Brook Simons Scholarship, 1989-1993

Special Experience



2024. "Lunar Flashlight science ground and flight measurements and operations using a multi-band laser reflectometer." Icarus 413 116013 [10.1016/j.icarus.2024.116013] [Journal Article/Letter]

2023. "Mineralogy, morphology, and emplacement history of the Maaz formation on the Jezero crater floor from orbital and rover observations." Journal of Geophysical Research: Planets [10.1029/2022je007612] [Journal Article/Letter]

2023. "Overview and Results From the Mars 2020 Perseverance Rover's First Science Campaign on the Jezero Crater Floor." Journal of Geophysical Research: Planets 128 (6): [10.1029/2022je007613] [Journal Article/Letter]

2023. "Samples Collected From the Floor of Jezero Crater With the Mars 2020 Perseverance Rover." Journal of Geophysical Research: Planets 128 (6): [10.1029/2022je007474] [Journal Article/Letter]

2023. "The Complex Exhumation History of Jezero Crater Floor Unit and Its Implication for Mars Sample Return." Journal of Geophysical Research: Planets 128 (6): [10.1029/2022je007628] [Journal Article/Letter]

2023. "Using the potassium‐argon laser experiment (KArLE) to date ancient, low‐K chondritic meteorites." Meteoritics & Planetary Science 58 (4): 591-611 [10.1111/maps.13960] [Journal Article/Letter]

2023. "In Situ Geologic Context Mapping Transect on the Floor of Jezero Crater from Mars 2020 Perseverance Rover Observations." Journal of Geophysical Research: Planets [10.1029/2022je007444] [Journal Article/Letter]

2023. "Exposure History of Apollo 17 Double-Drive Tube 73001/73002." 54th Lunar and Planetary Science Conference, held 13-17 March, 2023 at The Woodlands, Texas and virtually. LPI Contribution No. 2806, id.2206 54 [Proceedings]

2023. "The Specialized Penetrometer Instrument: SAMPLR and Beyond." Earth and Space 2022 [10.1061/9780784484470.013] [Proceedings]

2022. "Testing Rover Science Protocols to Identify Possible Biosignatures on Mars: Achieving Sampling Goals Under a Highly Constrained Time Line." Astrobiology 22 (11): 1310-1329 [10.1089/ast.2021.0177] [Journal Article/Letter]

2022. "A Mars 2020 Perseverance SuperCam Perspective on the Igneous Nature of the Máaz formation at Jezero crater and link with Séítah, Mars." Journal of Geophysical Research: Planets [10.1029/2022je007440] [Journal Article/Letter]

2022. "Using Rover-analogous Methodology to Discriminate between Volcanic and Sedimentary Origins in Successions Dominated by Igneous Composition." The Planetary Science Journal 3 (10): 240 [10.3847/psj/ac8429] [Journal Article/Letter]

2022. "An olivine cumulate outcrop on the floor of Jezero crater, Mars." Science 377 (6614): 1513-1519 [10.1126/science.abo2756] [Journal Article/Letter]

2022. "Aqueously altered igneous rocks sampled on the floor of Jezero crater, Mars." Science 377 (6614): [10.1126/science.abo2196] [Journal Article/Letter]

2022. "Identifying Shocked Feldspar on Mars Using Perseverance Spectroscopic Instruments: Implications for Geochronology Studies on Returned Samples." Earth, Moon, and Planets 126 (2): 4 [10.1007/s11038-022-09546-6] [Journal Article/Letter]

2022. "A lingering local exosphere created by a gas plume of a lunar lander." Icarus 376 114857 [10.1016/j.icarus.2021.114857] [Journal Article/Letter]

2022. "Development and Testing of a Sample Handling System for In-Situ Lunar Geochronology with KArLE." 2022 IEEE Aerospace Conference (AERO) [10.1109/aero53065.2022.9843302] [Proceedings]

2022. "Revolutionizing Access to the Mars Surface." California Institute of Technology , Pasadena, CA. [] [Report]

2021. "In Situ Geochronology for the Next Decade: Mission Designs for the Moon, Mars, and Vesta." The Planetary Science Journal 2 (4): 145 [10.3847/psj/abedbf] [Journal Article/Letter]

2021. "Strength In Diversity: Small Bodies as the Most Important Objects in Planetary Sciences." Vol. 53, Issue 4 (Planetary/Astrobiology Decadal Survey Whitepapers) 53 (4): [10.3847/25c2cfeb.fb837aba] [Journal Article/Letter]

2021. "Strategic Investment in Laboratory Analysis of Planetary Materials as Ground Truth for Solar System Exploration." Vol. 53, Issue 4 (Planetary/Astrobiology Decadal Survey Whitepapers) 53 (4): [10.3847/25c2cfeb.063f146a] [Journal Article/Letter]

2021. "Ensuring Inclusivity in the 2023 Planetary Science and Astrobiology Decadal Survey." Vol. 53, Issue 4 (Planetary/Astrobiology Decadal Survey Whitepapers) 53 (4): [10.3847/25c2cfeb.07d5698a] [Journal Article/Letter]

2021. "The Value of a Dual Anonymous System for Reducing Bias in Reviews of Planetary Research and Analysis Proposals and Scientific Papers." Bulletin of the American Astronomical Society 53 (4): [10.3847/25c2cfeb.450d4855] [Journal Article/Letter]

2021. "New Approaches to Lunar Ice Detection and Mapping." Bulletin of the American Astronomical Society 53 (4): [10.3847/25c2cfeb.bacb0f3b] [Journal Article/Letter]

2021. "Geochronology as a Framework for Inner Solar System History and Evolution." Bulletin of the American Astronomical Society 53 (4): [10.3847/25c2cfeb.1b2670e3] [Journal Article/Letter]

2020. "Interpreting and reporting 40Ar/39Ar geochronologic data." GSA Bulletin 133 (3-4): 461-487 [10.1130/b35560.1] [Journal Article/Letter]

2020. "Lunar Flashlight: Illuminating the Lunar South Pole." IEEE Aerospace and Electronic Systems Magazine 35 (3): 46-52 [10.1109/maes.2019.2950746] [Journal Article/Letter]

2020. "Is a Linear or a Walkabout Protocol More Efficient When Using a Rover to Choose Biologically Relevant Samples in a Small Region of Interest?." Astrobiology 20 (3): 327-348 [10.1089/ast.2019.2090] [Journal Article/Letter]

2020. "Impact Melt Facies in the Moon's Crisium Basin: Identifying, Characterizing, and Future Radiogenic Dating." Journal of Geophysical Research: Planets [10.1029/2019JE006024] [Journal Article/Letter]

2019. "In Situ Geochronology on Mars and the Development of Future Instrumentation." Astrobiology ast.2018.1871 [10.1089/ast.2018.1871] [Journal Article/Letter]

2019. "Using dust shed from asteroids as microsamples to link remote measurements with meteorite classes." Meteoritics & Planetary Science 54 (9): 2046-2066 [10.1111/maps.13348] [Journal Article/Letter]

2018. "Dating igneous rocks using the Potassium-Argon Laser Experiment (KArLE) instrument: a case study for ~380 Ma basaltic rocks." Rapid Communications in Mass Spectrometry [10.1002/rcm.8214] [Journal Article/Letter]

2018. "Testing the efficiency of rover science protocols for robotic sample selection: A GeoHeuristic Operational Strategies Test." Acta Astronautica 146 300-315 [10.1016/j.actaastro.2018.02.029] [Journal Article/Letter]

2018. "Diverse Lithologies and Alteration Events on the Rim of Noachian-Aged Endeavour Crater, Meridiani Planum, Mars: In Situ Compositional Evidence." Journal of Geophysical Research: Planets 123 (5): 1255-1306 [10.1002/2017je005474] [Journal Article/Letter]

2018. "Age Distribution of Lunar Impact-Melt Rocks in Apollo Drive-Tube 68001/2." Lunar and Planetary Science Conference 49 2732 [Proceedings]

2017. "A Two-Step K-Ar Experiment on Mars: Dating the Diagenetic Formation of Jarosite from Amazonian Groundwaters." Journal of Geophysical Research: Planets [10.1002/2017je005445] [Journal Article/Letter]

2017. "Determining best practices in reconnoitering sites for habitability potential on Mars using a semi-autonomous rover: A GeoHeuristic Operational Strategies Test." Acta Astronautica 132 268-281 [10.1016/j.actaastro.2016.12.018] [Journal Article/Letter]

2016. "The sustainability of habitability on terrestrial planets: Insights, questions, and needed measurements from Mars for understanding the evolution of Earth-like worlds." Journal of Geophysical Research: Planets 121 (10): 1927-1961 [10.1002/2016je005134] [Journal Article/Letter]

2016. "The Main-belt Asteroid and NEO Tour with Imaging and Spectroscopy (MANTIS)." 2016 IEEE Aerospace Conference [10.1109/aero.2016.7500757] [Proceedings]

2016. "Ni/S/Cl systematics and the origin of impact-melt glasses in Martian meteorite Elephant Moraine 79001." Meteoritics & Planetary Science 51 (4): 663-680 [10.1111/maps.12612] [Journal Article/Letter]

2016. "CubeSat for investigating ice on the Moon." SPIE Newsroom [10.1117/2.1201601.006241] [Journal Article/Letter]

2015. "Pre-Mission Input Requirements to Enable Successful Sample Collection by a Remote Field/EVA Team." Journal of Human Performance in Extreme Environments 12 (1): [10.7771/2327-2937.1071] [Journal Article/Letter]

2015. "Solar Sail Propulsion for Interplanetary Cubesats." 51st AIAA/SAE/ASEE Joint Propulsion Conference [10.2514/6.2015-3895] [Proceedings]

2015. "Context of ancient aqueous environments on Mars from in situ geologic mapping at Endeavour Crater." Journal of Geophysical Research: Planets 120 (3): 538-569 [10.1002/2014je004699] [Journal Article/Letter]

2014. "The Potassium-Argon Laser Experiment (KArLE):In SituGeochronology for Planetary Robotic Missions." Geostandards and Geoanalytical Research 38 (4): 421-439 [10.1111/j.1751-908x.2014.00319.x] [Journal Article/Letter]

2014. "Testing Mars Exploration Rover-inspired operational strategies for semi-autonomous rovers on the moon II: The GeoHeuristic operational Strategies Test in Alaska." Acta Astronautica 99 24-36 [10.1016/j.actaastro.2014.01.019] [Journal Article/Letter]

2014. "Sands at Gusev Crater, Mars." Journal of Geophysical Research: Planets 119 (5): 941-967 [10.1002/2013je004535] [Journal Article/Letter]

2013. "Comparing Apollo and Mars Exploration Rover (MER)/phoenix operations paradigms for human exploration during NASA Desert-RATS science operations." Acta Astronautica 90 (2): 311-317 [10.1016/j.actaastro.2011.10.001] [Journal Article/Letter]

2013. "High-velocity collisions from the lunar cataclysm recorded in asteroidal meteorites." Nature Geoscience 6 (5): 411-411 [10.1038/ngeo1803] [Journal Article/Letter]

2013. "The Vestan cataclysm: Impact-melt clasts in howardites and the bombardment history of 4 Vesta." Meteoritics & Planetary Science 48 (5): 771-785 [10.1111/maps.12101] [Journal Article/Letter]

2013. "Desert Research and Technology Studies (DRATS) 2010 science operations: Operational approaches and lessons learned for managing science during human planetary surface missions." Acta Astronautica 90 224-241 [DOI:10.1016/j.actaastro.2012.03.009] [Journal Article/Letter]

2012. "A crowded Solar System." Nature Geoscience 6 (1): 14-15 [10.1038/ngeo1694] [Journal Article/Letter]

2012. "NASA'S Robotic Lunar Lander Development Project." Acta Astronautica 79 221-240 [10.1016/j.actaastro.2012.03.025] [Journal Article/Letter]

2012. "Ancient Impact and Aqueous Processes at Endeavour Crater, Mars." Science 336 (6081): 570-576 [10.1126/science.1220476] [Journal Article/Letter]

2011. "Testing Mars-inspired operational strategies for semi-autonomous rovers on the Moon: The GeoHeuristic Operational Strategies Test in New Mexico." Mars 6 13-31 [10.1555/mars.2011.0002] [Journal Article/Letter]

2011. "Vision and Voyages for Planetary Science in the Decade 2013-2022." [doi:] [Book]

2010. "Visible and near-infrared multispectral analysis of geochemically measured rock fragments at the Opportunity landing site in Meridiani Planum." Journal of Geophysical Research 115 E00F10 [10.1029/2010je003660] [Journal Article/Letter]

2010. "Mineralogy and chemistry of cobbles at Meridiani Planum, Mars, investigated by the Mars Exploration Rover Opportunity." Journal of Geophysical Research 115 E00F05 [10.1029/2010je003621] [Journal Article/Letter]

2010. "53Mn–53Cr and 26Al–26Mg ages of a feldspathic lithology in polymict ureilites." Earth and Planetary Science Letters 295 (3-4): 531-540 [10.1016/j.epsl.2010.04.036] [Journal Article/Letter]

2010. "The Surface Composition of Ceres." Space Science Reviews, Online First 101 [Full Text] [10.1007/s11214-010-9677-4] [Journal Article/Letter]

2009. "Why aqueous alteration in asteroids was isochemical: High porosity≠high permeability." Earth and Planetary Science Letters 287 (3-4): 559-568 [10.1016/j.epsl.2009.09.004] [Journal Article/Letter]

2009. "Exploration of Victoria Crater by the Mars Rover Opportunity." Science 324 (5930): 1058-1061 [10.1126/science.1170355] [Journal Article/Letter]

2008. "Iron mineralogy and aqueous alteration from Husband Hill through Home Plate at Gusev Crater, Mars: Results from the Mössbauer instrument on the Spirit Mars Exploration Rover." Journal of Geophysical Research 113 (E12): E12S42 [10.1029/2008je003201] [Journal Article/Letter]

2008. "Geochemical properties of rocks and soils in Gusev Crater, Mars: Results of the Alpha Particle X-Ray Spectrometer from Cumberland Ridge to Home Plate." Journal of Geophysical Research 113 (E12): E12S39 [10.1029/2008je003195] [Journal Article/Letter]

2008. "Degradation of Victoria crater, Mars." Journal of Geophysical Research 113 (E11): E11010 [10.1029/2008je003155] [Journal Article/Letter]

2008. "Structure, stratigraphy, and origin of Husband Hill, Columbia Hills, Gusev Crater, Mars." Journal of Geophysical Research 113 (E6): E06S03 [10.1029/2007je003041] [Journal Article/Letter]

2008. "Mineralogy of volcanic rocks in Gusev Crater, Mars: Reconciling Mössbauer, Alpha Particle X-Ray Spectrometer, and Miniature Thermal Emission Spectrometer spectra." Journal of Geophysical Research 113 (E6): E06S04 [10.1029/2007je002970] [Journal Article/Letter]

2008. "Soil sedimentology at Gusev Crater from Columbia Memorial Station to Winter Haven." Journal of Geophysical Research 113 (E6): E06S05 [10.1029/2007je002953] [Journal Article/Letter]

2007. "What are the real constraints on the existence and magnitude of the late heavy bombardment?." Icarus 189 (1): 233-245 [10.1016/j.icarus.2006.12.020] [Journal Article/Letter]

2007. "Comment on: “New” lunar meteorites: Impact melt and regolith breccias and large-scale heterogeneities of the upper lunar crust, by P. H. Warren, F. Ulff-Møller, and G. W. Kallemeyn." Meteoritics & Planetary Science 42 (6): 1029-1032 [10.1111/j.1945-5100.2007.tb01148.x] [Journal Article/Letter]

2007. "Pyroclastic Activity at Home Plate in Gusev Crater, Mars." Science 316 (5825): 738-742 [10.1126/science.1139045] [Journal Article/Letter]

2007. "The Scientific Context for Exploration of the Moon." [doi:] [Book]

2006. "Mössbauer mineralogy of rock, soil, and dust at Meridiani Planum, Mars: Opportunity's journey across sulfate-rich outcrop, basaltic sand and dust, and hematite lag deposits." Journal of Geophysical Research: Planets 111 (E12): [10.1029/2006je002791] [Journal Article/Letter]

2006. "The Meteoritical Bulletin, No. 90, 2006 September." Meteoritics & Planetary Science 41 (9): 1383-1418 [10.1111/j.1945-5100.2006.tb00529.x] [Journal Article/Letter]

2006. "Quantifying the amount of impact ejecta at the MER landing sites and potential paleolakes in the southern Martian highlands." Geophysical Research Letters 33 (5): L05203 [10.1029/2005gl024963] [Journal Article/Letter]

2005. "Geochemistry and40Ar-39Ar geochronology of impact-melt clasts in feldspathic lunar meteorites: Implications for lunar bombardment history." Meteoritics & Planetary Science 40 (5): 755-777 [10.1111/j.1945-5100.2005.tb00978.x] [Journal Article/Letter]

2004. "Feldspathic clast populations in polymict ureilites: Stalking the missing basalts from the ureilite parent body." Geochimica et Cosmochimica Acta 68 (20): 4249-4266 [10.1016/j.gca.2004.01.027] [Journal Article/Letter]

2004. "Lunar highland meteorite Dhofar 026 and Apollo sample 15418: Two strongly shocked, partially melted, granulitic breccias." Meteoritics & Planetary Science 39 (9): 1419-1447 [10.1111/j.1945-5100.2004.tb00120.x] [Journal Article/Letter]

2004. "Analyses of the chondritic meteorite Orvinio (H6): Insight into the origins and evolution of shocked H chondrite material." Meteoritics & Planetary Science 39 (9): 1475-1493 [10.1111/j.1945-5100.2004.tb00123.x] [Journal Article/Letter]

2004. "Petrogenesis of lunar highlands meteorites: Dhofar 025, Dhofar 081, Dar al Gani 262, and Dar al Gani 400." Meteoritics & Planetary Science 39 (4): 503-529 [10.1111/j.1945-5100.2004.tb00916.x] [Journal Article/Letter]

2003. "A Nebular Origin for Chondritic Fine-Grained Phyllosilicates." Science 299 (5606): 549-552 [10.1126/science.1079427] [Journal Article/Letter]

2002. "Cataclysmic bombardment throughout the inner solar system 3.9–4.0 Ga." Journal of Geophysical Research 107 (E2): 5009 [10.1029/2001je001529] [Journal Article/Letter]

2001. "Argon-40-argon-39 chronology and petrogenesis along the eastern limb of the Moon from Luna 16, 20 and 24 samples." Meteoritics & Planetary Science 36 (10): 1345-1366 [10.1111/j.1945-5100.2001.tb01829.x] [Journal Article/Letter]

2000. "Support for the Lunar Cataclysm Hypothesis from Lunar Meteorite Impact Melt Ages." Science 290 (5497): 1754-1756 [10.1126/science.290.5497.1754] [Journal Article/Letter]

2000. "Modeling of Liquid Water on CM Meteorite Parent Bodies and Implications for Amino Acid Racemization." Icarus 145 (2): 369-381 [10.1006/icar.1999.6329] [Journal Article/Letter]

2000. "Racemization of Meteoritic Amino Acids." Icarus 145 (1): 272-281 [10.1006/icar.1999.6328] [Journal Article/Letter]

2000. "Noble gases in iddingsite from the Lafayette meteorite: Evidence for liquid water on Mars in the last few hundred million years." Meteoritics & Planetary Science 35 (1): 107-115 [10.1111/j.1945-5100.2000.tb01978.x] [Journal Article/Letter]

1999. "AMBASSADOR: Asteroid sample return mission to 7 Iris." Acta Astronautica 45 (4-9): 415-422 [10.1016/s0094-5765(99)00161-7] [Journal Article/Letter]

1997. "The determination of ice composition with instruments on cometary landers." Acta Astronautica 40 (9): 663-674 [10.1016/s0094-5765(97)00005-2] [Journal Article/Letter]

1993. "Synthesis of the new compound CaFe(CO3)2 and experimental constraints on the (Ca,Fe)CO3 join." Geochimica et Cosmochimica Acta 57 (23-24): 5105-5109 [10.1016/0016-7037(93)90612-z] [Journal Article/Letter]


2020. "Lunar Water ISRU Measurement Study (LWIMS): Establishing a Measurement Plan for Identification and Characterization of a Water Reserve." NASA Technical Memorandum 20205008626 [] [Report]

2019. "Ten Years of the Lunar Reconnaissance Orbiter (LRO): Advancing Lunar Science and Context for Future Lunar Exploration." Proceedings of the 50th Lunar and Planetary Science Conference, The Woodlands, Texas, U.S.A., March 18-22, 2019 Paper # 2780 [Full Text] [Proceedings]

2018. "Curie: Constraining Solar System Bombardment Using In Situ Radiometric Dating." Lunar and Planetary Science Conference 49 [Proceedings]

2017. "Near-Surface Age Distribution of Lunar Impact-Melt Rocks." 2017 Annual Meeting of the Lunar Exploration Analysis Group 2041 [Proceedings]

2017. "Determining the Mineralogy of Lunar Samples Using Micro Raman Spectroscopy: Comparisons Between Polished and Unpolished Samples." 2017 Annual Meeting of the Lunar Exploration Analysis Group 2041 [Proceedings]