Assistant professor at the Institute of Marine and Limnological Sciences of the Austral University of Chile, he obtained his degree in Marine Biology at the Santísima Concepción Catholic University and a Master’s degree in Oceanography at the Concepción University. PhD in Natural Sciences from the University of Bremen and the Max Planck Institute for Marine Microbiology, after a post-doctorate at the University of Toronto, Dr. Jessen conducts research on life-Earth interaction at the microbial level.
Dr. Jessen investigates geochemical and microbial dynamics from pristine to anthropogenically impacted systems. His research currently focuses on hydrothermal ecosystems, particularly Deception Island, Antarctica.
Jessen GL, Lichtschlag A, Alban Ramette, Pantoja S, Pamela E. Rossel, Carsten J. Schubert, Struck U and Boetius A. (2017) Hypoxia causes preservation of labile organic matter and changes seafloor microbial community composition (Black Sea). Science Advances, 3 (2). http://advances. sciencemag.org/content/3/2/e1601897.
Whaley-Martin K*, Jessen GL*, Nelson TC, Mori JF, Apte S, Jarolimek C and Warren LA (2019) The Potential Role of Halothiobacillus spp. in Sulfur Oxidation and Acid Generation in Circum-Neutral Mine Tailings Reservoirs. Frontiers in Microbiology. 10:297. https://www.frontiersin.org/articles/10.3389/fmicb.2019.00297/full.
Jessen GL, Lichtschlag A, Pantoja S, Struck U and Boetius A. (2016) Distribution and composition of thiotrophic mats in the hypoxic zone of the Black Sea (150-170m water depth, Crimea margin). Frontiers in Microbiology, 7 (1011). http://journal.frontiersin.org/article/10.3389/fmicb.2016.01011/full.
Jessen GL, Pantoja S, Gutiérrez MA, Quiñones RA, González RR, Sellanes J, Kellermann MY, K-U Hinrichs (2011). Methane in shallow cold seeps at Mocha Island off central Chile. Continental Shelf Research. 31(6), 574-581. http://dx.doi.org/10.1016/j.csr.2010.12.012.
Jessen GL, Quiñones RA, González RR (2009). Aerobic and anaerobic enzymatic activity and allometric scaling of the deep benthic polychaete Hyalinoecia artifex (Polychaeta: Onuphidae) Journal of the Marine Biological Association of the United Kingdom 89, 1171-1175.http://dx.doi.org/10.1017/S0025315409000538.