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Current Professional Appointments

  • Institut d’Astrophysique Spatiale, Université Paris-Saclay, Marie Curie Postdoctoral Fellow. 2023-present.

  • Planetary Science InstituteResearch Scientist. 2022-present.

Past Professional Appointments

  • Jet Propulsion Laboratory, Caltech, Postdoctoral Fellow. 2020-2022.

  • Gemological Institute of AmericaResearch Laboratory Technician, diamond color origin. 2013-2015.

Education

  • 2020   Ph.D., Brown University, Earth, Environmental & Planetary Sciences.

    • ​Spatial and temporal variations in the chemistry and mineralogy of mafic lacustrine systems on Earth and Mars. Advisor: Ralph Milliken.

  • 2017   M.Sc., Brown University, Earth, Environmental & Planetary Sciences.

    • Spectroscopic analysis of iron cycling in a terrestrial ultramafic lake and its implications for martian sedimentary systems. Advisor: Ralph Milliken.

  • 2013   B.A., Columbia University, Earth Science.

    • Extractable organic molecules are an effective thermometer of both naturally and artificially heated fault rocks. Advisors: Pratigya Polissar & Heather Savage.

Research Grants

  • 2025-2028 Mars Science Laboratory Participating Scientist Program Augmentation (MSL-PSE25), NASA ROSES. PI. “Identifying primary and secondary hydrous minerals in upper strata of Mt. Sharp.” ($50,000.)

  • 2023-2026 Mars Data Analysis Program (MDAP), NASA ROSES. Co-I. “Analyses of sulfates in chaos regions on Mars.” ($540,000.)

  • 2023-2025 Marie Sklodowska-Curie Actions research fellowship, European Commission (MSCA-EF). PI. “Spectral diversity within Ryugu.” (€210,000.)

  • 2022-2025 Mars Science Laboratory Participating Scientist Program (MSL-PSP). PI. “Understanding Mg-sulfate distribution, hydration state, and crystallinity in Mt. Sharp.” ($300,000.)

  • 2022 Spontaneous Research and Technology Development Program, Jet Propulsion Laboratory. Co-I. “Novel reaction design to test martian weathering.” ($40,000.)

  • 2022 Data Science Working Group, Jet Propulsion Laboratory. Co-I. “Developing machine learning models to facilitate the untargeted identification and classification of organics in complex mixtures via tandem mass spectrometry.” ($50,000.)

  • 2020-2022 Strategic Research and Technology Development Program, Jet Propulsion Laboratory. Science PI. “Experimental constraints on groundwater driven redox gradients on Mars.” ($300,000.)

Awards and Fellowships

•2022 Seal of Excellence, European Commission Marie Sklodowska-Curie Actions (MSCA-2021-PF).

•2020 Dissertation Fellowship, Brown University.

• 2015, 2017 NASA Group Achievement Award, MSL Science and Operations Team.
• 2015-2018 Presidential Fellowship for 3 years full support, Brown University Graduate School.
• 2013 Walter C. Pitman III Award for excellence in thesis research and presentation, Columbia University.

Mission Experience

  • OSIRIS-REx, MicrOmega Team. 2023-present.

  • Hayabusa2, MicrOmega Team. 2023-present.

  • Mars Science Laboratory/Curiosity rover, CheMin Team. 2025-present.

  • Mars Science Laboratory/Curiosity rover, Participating Scientist. 2022-present.

  • Mars Science Laboratory/Curiosity rover, Science Team collaborator. 2016-2022.

Field Work and Short Courses

  • 2018 Naukluft Mountains, Namibia, 12 days in the field, Agouron Institute Advanced Geobiology Field School, Caltech.

  • 2016 Guadalupe Mountains, TX, 5 days in the field, Brown University.

  • 2013 Punchbowl Fault, San Gabriel Mountains, CA, 3 days in the field, Columbia University.

  • 2012 Catskill Mountains, NY, 12 days in the field, Columbia University.

  • 2011 Champlain Thrust Fault, Adirondack Mountains, VT, 2 days in the field, Columbia University.

Teaching

  • 2024 Lecturer, Planetary Surfaces Summer School, University of Glasgow.

  • 2024 Co-Instructor, summer course (Wine and Climate Change), Rice University Global Paris Center, Paris, France.

  • 2018 Instructor, summer course (Our Solar System Up Close), Brown University.

  • 2018 Teaching Assistant, Planetary Geology (GEOL0810), Brown University.

  • 2017 Teaching Assistant, summer course (Our Solar System Up Close), Brown University.

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Mentoring

  • 2024-2025 Undergraduate advisees hosted by Institut d’Astrophysique Spatiale: Maëlys Boubet, Talia Druon. 

  • 2024 Tuteur, Stage de 3e (1 student, 1 week), Institut d’Astrophysique Spatiale.

  • 2024 Tuteur, Stage de 3e (1 student, 1 week), Institut d’Astrophysique Spatiale.

  • 2023 Tuteur, Stage de 3e (12 students, 1 day), Institut d’Astrophysique Spatiale.

  • 2021 Undergraduate advisees hosted by Caltech/JPL: Henry Manelski (now a PhD student at Purdue), Jordan Ando (now a PhD student at U. of Hawaii).

  • 2016-2020 Undergraduate advisees hosted by Brown University: Ana Colon (now a PhD student at U. of Oregon), Christopher Yen (went on to earn a 2024 PhD from WashU), Sarah Martinez, Grant Rutherford (now a PhD student at MIT), Catherine Miranda.

  • 2018 Leadership Alliance Program Mentor, Brown University’s Leadership Alliance Program. Led weekly meetings with interns focused on completing a NSF-GRFP-style research proposal, poster presentation, and oral presentation.

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Recent Service and Outreach (last 5 years)

  • 2025 Panelist, NASA review panel.

  • 2024 Panelist, NASA review panel.

  • 2024 Session Chair, The 10th International Conference on Mars, “Carbonates and the Jezero Margin Unit.”

  • 2024 Proposal reviewer, Deutsche Forschungsgemeinschaft (DFG).

  • 2023 Panelist, NASA review panel.

  • 2023 Panelist, NASA review panel.

  • 2023 Judge, Mission Design Challenge, Womanium Global Astrobiology Program.

  • 2022 Session Convener, AbSciCon, “Diagenesis and Subsurface Habitable Environments.”

  • 2021 Reviewer, Graduate Women In Science (GWIS) National Fellowship Program.

  • 2020 Panelist, NASA review panel.

©2018 Rachel Sheppard

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