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Joel A. Hurowitz is a leading figure in planetary geochemistry and astrobiology, renowned for his work on the geochemical evolution of Mars and the search for habitable environments beyond Earth. His research centers on the chemical and mineralogical processes that shape planetary surfaces, with a particular focus on the sedimentary rock record of Mars. Hurowitz made a pivotal contribution as the Deputy Principal Investigator for the PIXL instrument (Planetary Instrument for X-Ray Lithochemistry) aboard NASA’s Perseverance rover, a cutting-edge X-ray fluorescence spectrometer that maps elemental chemistry at microscopic scales to assess past habitability on Mars. His highly cited 2020 paper detailing PIXL’s design and capabilities has garnered over 135 citations, underscoring its foundational role in current Mars exploration. In a landmark 2018 study, Hurowitz provided compelling evidence for ancient river plume deposits in Gale crater, interpreting the Murray formation’s sedimentary layers as products of plunging river plumes—a finding that reshaped understanding of Mars’ aqueous history and its potential to support life. With over 126 citations, this work highlights his impact on sedimentary geology. Hurowitz’s research continues to drive forward our knowledge of planetary habitability, making him a key voice in the next generation of Mars science.