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Gregory Adam Brennecka

Portrait of  Gregory Adam Brennecka

  • Title
    Staff Scientist
  • Email
    brennecka2@llnl.gov
  • Phone
    (925) 423-8502
  • Organization
    Not Available

Research Appointments

  • 2019 – present: Staff scientist – Lawrence Livermore National Laboratory
  • 2014 – 2019: Institut für Planetologie, University of Münster
  • 2013 – 2014: Postdoctoral Researcher – Lawrence Livermore National Lab – Nuclear Forensics Group
  • 2011 – 2013: Postdoctoral Researcher – School of Earth and Space Exploration – Arizona State University

Research Interests

Greg Brennecka's research focuses on using chemical and isotopic signatures to unravel the formation and history of a sample. The majority of his work has been on the formation and early evolution of the Solar System by looking at meteorites to better understand supernovae injection into the protoplanetary disk, early Solar System conditions and their implications for the origin of life. Greg also has used isotopic signatures to study the history of oxygen in the ocean and its influence on various mass extinction events, as well as tracing the provenance of various materials.

Arizona State University – Isotope Geochemistry Ph.D., 2007-2011

University of Rochester – Nuclear Chemistry coursework, 2006

Oregon State University – Geochemistry/Ore Deposits M.S., 2003-2006

University of Missouri-Columbia – Geological Sciences B.S., 2000-2003

Columbia College – Natural Science/Chemistry B.S., 1998-2002

View ORCID and additional publications on Google Scholar.

J.F.J. Bryson and G.A. Brennecka (2021). Constraints on chondrule generation, disk dynamics, and asteroid accretion from the compositions of carbonaceous meteorites. The Astrophysical Journal 912:163, (24pp).

J. Render and G.A. Brennecka (2021). Isotopic signatures as tools to reconstruct the primordial architecture of the Solar System. Earth & Planetary Science Letters 555, 116705.

Q.R. Shollenberger, L.E. Borg, E.C. Ramon, M.A. Sharp, G.A. Brennecka (2021). Samarium isotope compositions of uranium ore concentrates: A novel nuclear forensic signature. Talanta 221, 121431.

G.A. Brennecka, C. Burkhardt, G. Budde, T.S. Kruijer, F. Nimmo, T. Kleine (2020). Astronomical context of Solar System formation from molybdenum isotopes in meteorite inclusions. Science 370, 837-840.

Q.R. Shollenberger and G.A. Brennecka (2020). Dy, Er, and Yb isotope compositions of meteorites and their components: Constraints on presolar carriers of the rare earth elements. Earth & Planetary Science Letters 529, 115866.

C. Burkhardt, L.E. Borg, G.A. Brennecka, Q.R. Shollenberger, N. Dauphas, T. Kleine (2016). A nucleosynthetic origin of the Earth’s anomalous 142Nd composition. Nature 537, 394-398.

G.A. Brennecka, L.E. Borg, M. Wadhwa (2014). Insights into the Martian Mantle: The Age and Isotopics of the Meteorite Fall Tissint. Meteoritics & Planetary Science 49, 412-418.

G.A. Brennecka, L.E. Borg, M. Wadhwa (2013). Evidence for supernova injection into the solar nebula and the decoupling of r-process nucleosynthesis. Proceedings of the National Academy of Sciences 110, 17241-17246.

G.A. Brennecka and M. Wadhwa (2012). Uranium isotope compositions of the basaltic angrite meteorites and the chronological implications for the early Solar System. Proceedings of the National Academy of Sciences 109, 9299-9303.

G.A. Brennecka, A.D. Herrmann, T.J. Algeo, A.D. Anbar (2011). Rapid expansion of oceanic anoxia immediately before the end-Permian mass extinction. Proceedings of the National Academy of Sciences 108,17631.

G.A. Brennecka, S. Weyer, M. Wadhwa, P.E. Janney, J. Zipfel, A.D. Anbar (2010). 238U/235U variations in meteoritic material: Extant 247Cm and implications for Pb-Pb dating. Science 327, 449.

G.A. Brennecka, L.E. Borg, I.D. Hutcheon, M.A. Sharp, A.D. Anbar (2010). Natural variations in uranium isotope ratios of uranium ore concentrates: Understanding the fractionation mechanism. Earth & Planetary Science Letters 291, 228-233.

  • 2016 – Nier Prize, Meteoritical Society
  • 2014-2019 – Humboldt Foundation, Sofja Kovalevskaja Award
  • 2013 – Department of Homeland Security, Postdoctoral Fellowship – LLNL
  • 2010-2011 – NASA Earth and Space Science Fellow
  • 2010 – Geological Society of America, Outstanding Student Research Award
  • 2010 – Achievement Reward for College Scientists (ARCS) scholar
  • 2009-2010 – H. Nininger Award for outstanding original research paper submitted during 2009
  • 2009 – Brian Mason Award, Meteoritical Society