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I am interested in global biogeochemical cycles, seawater chemistry, and paleoclimatology on various geologic timescales. Stable isotope geochemistry and numerical modeling are the primary techniques for my research. My current project focus on the high...

My work mainly focuses on establishing novel mineral proxies to track sulfur cycle dynamics in deep time, notably carbonate-associated sulfate (CAS). This system, alongside the robust yet infrequent barite record, potentially represents a powerful way to...

She/Her/Hers My name is Daianne, and I am originally from Brazil, where I obtained a BSc in Geology and an MSc in Geochemistry. During my studies at Texas A&M University, I transitioned from U-Pb zircon geochronology to organic geochemistry. Isotopes are...

She/Her/Hers

Val received her BS in Earth Sciences (paleobiology & geology) from UC Santa Barbara in 2021. As an RA at Johns Hopkins University, she became interested in using lab and field techniques to answer questions related to perturbations in...

Karina was an undergraduate joint concentrator in Earth and Planetary Science and Environmental Engineering who has been working with the Johnston Group since her sophomore year. Her interests in biogeochemistry carries across sulfur, oxygen, and nitrogen...

Ben is an isotope geochemist with diverse interests in the Earth sciences. In the Johnston Group, he is currently exploring questions surrounding the evolution of the atmosphere and biosphere over the most recent billion years of Earth history using a...

Now on faculty at Johns Hopkins UniversityMaya is interested in how the cycling of elements through the ocean and atmosphere regulates climate and habitability. Specifically, she focuses on how the sulfur cycle interacts with the carbon, oxygen, and...

He/Him/His
I'm interested in connections between the geologic and biospheric carbon cycles. Specifically, my work aims to understand how processes occurring in river basins transfer carbon between these two cycles in order to regulate atmospheric CO2...

I combine approaches from the bio- and geo-sciences to address big-picture questions about the history of life on Earth and the potential for life elsewhere. This research is motivated by a desire to understand how life and the planet have changed...

The intimate interaction between microbial life and earth leaves specific chemical signatures that record information on microbial activity, and paleo-environmental conditions. As a geobiologist, my goal is to interpret these signatures and reconstruct...