2021          Ph.D. in Applied Environmental Science, Biogeochemistry Research Group, Stockholm University, Sweden

2016         M.Sc. in Quaternary Science, Institute of Geology and Mineralogy, University of Cologne, Germany

2014          B.Sc. in Physical Geography, Geology and Biology, Geographical Institute, University of Cologne, Germany

03/2022 – present Postdoctoral Research Fellow, Lamont-Doherty Earth Observatory, Columbia University

03/2022 – present Adjunct Postdoctoral Scientist, Department of Environmental Science, Stockholm University

06/2021 – 02/2022 Postdoctoral Research Fellow, Department of Environmental Science, Stockholm University

02/2016 – 05/2021 Graduate Research Assistant, Department of Environmental Science, Stockholm University

01/2015 – 12/2016 Research Assistant, Institute of Geology and Mineralogy, University of Cologne

• National Science Foundation U.S. Science Support Program Post-expedition award: Late Cenozoic Climate History of Greenland based on plant biomarker and foraminifera shell geochemistry; $20,000 to J. Martens (PI), 2024-2025 

• Columbia Climate School Undergraduate Research Assistant grant: Arctic Ocean acidification during past climate change: Reconstructing pCO2 and pH using geochemical proxies in Arctic sediment records; Columbia Climate School; $ 5,160 to J. Martens (co-PI) and S. Hurley (co-PI), 2022-2023 

• LDEO Climate Center grant: Reconstructing pCO2 and pH using δ11B in planktic foraminifera and microbial biomarkers in marine sediment records; Lamont-Doherty Earth Observatory; $ 11,000 to J. Martens (co-PI) and S. Hurley (co-PI), 2022-2023

• International Postdoc Research Grant: Arctic Ocean acidification from land-ocean carbon transfer during past and present climate change; Swedish Research Council; 3.5 M SEK ($ 350k) to J. Martens (PI; 2022-2024) 

• Arctic Ocean Expedition proposal onboard ib Oden: Eurasian-Arctic Shelf-Basin Interactions of Climate-Cryosphere-Carbon Contaminants (EURASIAN ARCTIC C4); Swedish Polar Research Secretariat. Awarded with 20+ co-PI’s incl. J. Martens (expedition scheduled for 2023 - cancelled due to Ukraine war)

2023          International Ocean Discovery Program (IODP) Expedition 400: NW Greenland Glaciated Margin, onboard rv JOIDES Resolution, 08/13–10/13/23, onboard organic geochemist

2020          Arctic Ocean Expedition: International Siberian Shelf Study - ISSS 2020, 6 weeks onboard rv A. M. Keldysh, co-coordination of sediment sampling, cruise planning assistant

2020          Baltic Sea Expedition, 1 week onboard rv Electra, preparation and coordination of sediment sampling

2015          Lena River Delta, 4 weeks at Samoylov Research Station, Siberia, Russia