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David Zakharov joins the Department in Winter 2023 after his postdoctoral appointment at the Université de Lausanne, Switzerland. His research interests are in petrology, water-rock interaction and stable isotope geochemistry. David explores the geochemical co-evolution of Earth’s crust and hydrosphere with an emphasis on igneous and metamorphic processes. His current projects target 1) Archean subaerial magmatism, 2) environmental conditions recorded in Precambrian and modern cherts and 3) reactive circulation of fluids within the oceanic crust. In large, these projects use petrographic characterization, O and H isotope geochemistry (δ¹⁸O, δD and Δ¹⁷O), geochronology and in-situ SIMS measurements. For more information see the website. [https:// ].