Research Associates

Sergey Oleynik
Isotope Lab Manager
Office Phone
Office
M45 Guyot Hall

Sergey has always been fascinated by the mechanical workings of things surrounding him - clocks, toys, pianos… His desire to know how the world is constructed brought him to the Russian chemical-technological university in Moscow, where he discovered the amazing power of the mass spectrometer to investigate the world. Sergey obtained his PhD…

Udara Amarathunga
Harry H. Hess Postdoctoral Research Fellow

Title: Harry H. Hess Postdoctoral Research Fellow

Area(s): Geochemistry

Research Summary:  He investigates past changes of ocean and the climate to resolve the timing and magnitude of natural climate variability, using Nitrogen and Oxygen isotope measurements…

Dario Marconi
Associate Research Scholar
Research Staff
Office Phone
Office
A15 Guyot Hall

Ph.D., 2017, "Use of the Nitrate Isotopes in the Ocean Interior to Explore the Isotopic Composition of Sinking Nitrogen and its Implications for Marine Biogeochemical Cycles"

Xuyuan (Ellen) Ai
Postdoctoral Research Fellow
Linhan Shen
Associate Research Scholar
Research Staff
Office Phone
Office
158 Guyot Hall

Linhan Shen is a Postdoctoral Research Associate at Princeton University.  Linhan’s research in the Sigman Group is on the development of an optical spectrometer for nitrogen isotope analysis.  This work is in collaboration with Prof. Gerard Wyscocki from Princeton University for the development of this instrument.  Linhan…

Tanya Marshall
Princeton Presidential Fellow
Office
15 Guyot Hall

Research Summary: Tanya’s research explores nutrient supply and biogeochemical cycling in the modern ocean using geochemical tracers like nitrate isotopes and nutrient stoichiometry. Her Ph.D. (2023) focussed on characterising nitrogen cycling in the understudied South Atlantic and South Indian Oceans, and how local and…

Pierre Cadeau
Visiting Associate Research Scholar
Research Staff
Office
A-15 Guyot Hall
Jessica Lueders-Dumont
Visiting Postdoctoral Researcher (Boston College)
Research Staff

I am a geochemist and ecologist focused on trophic ecology and biogeochemistry of modern and past aquatic environments, primarily through the use of the nitrogen isotopes (δ15Noto) in modern and fossil fish otoliths (ear stones) and corals. I am applying δ15Noto to investigate food web variations in past oceans, from mid-Holocene…