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Graduate Student Profiles

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Alexis Stansfield, graduate student in Lehigh's earth and environmental sciences program

Alexis Stansfield

PhD Candidate
ars519@lehigh.edu

Office Location: ST 140

Area of Specialization: Paleoecology, paleoclimate

Alexis earned her B.S. in Biology from Florida Gulf Coast University in 2019, with a minor in geology. She has a lifelong interest in paleontology, which was broadened during an undergraduate paleoclimatology course where she collected mangrove peat cores to identify hurricane deposits. In her current research, Alexis studies Arctic peat cores to learn about past environmental conditions, focusing on the response of Sphagnum moss and testate amoebae to the past 200 years of rapid anthropogenic global warming. By incorporating techniques on every scale from mass spectrometry of carbon isotopes, to identifying microbes and plant fragments under the microscope, and even peat accumulation modeling, she can build a comprehensive view of what is happening in this ecosystem during such drastic change. While she doesn’t know exactly what’s next after graduate school, she would love to continue doing anything related to wetlands, whether that’s collecting data on the plants, water, or wildlife as a scientist, working for a regulatory agency, helping to map and manage wetlands for restoration and conservation, or teaching at a university. In her free time, Alexis enjoys an eclectic lineup of hobbies, including camping, paddleboarding, adventure RPG video games, yoga, brain-teaser puzzles and trivia.

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Holly Stapelfeldt, graduate student in Lehigh's earth and environmental sciences program

Holly Stapelfeldt

hos224@lehigh.edu
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Nafisa Tasnim

PhD Student
nat324@lehigh.edu

Office Location: ERC B235

Area of Specialization: Extraction of Rare Earth Elements from Coal Combustion Residues

Nafisa Tasnim is a Ph.D. researcher in Mechanical Engineering at Lehigh University, specializing in heat transfer, computational modeling, and sustainable energy systems. She earned her B.Sc. in Mechanical Engineering from the Islamic University of Technology (IUT), where her thesis focused on optimizing vortex generators for enhanced heat transfer in compact heat exchangers. Her research spans computational fluid dynamics (CFD), battery modeling, and rare earth element (REE) extraction. She is currently contributing to a $2.5 million DOE-funded project on recovering critical minerals from utility waste streams, advancing resource sustainability. Her work on CFD modeling, battery simulations, and machine learning applications in energy systems has been published in leading journals and conferences. Professionally, she has worked as an Assistant Mechanical Engineer at Doreen Power Generations and Systems LTD., overseeing power plant commissioning, fuel analysis, and mechanical integration. She also applied her engineering expertise in AI-driven hydroponic systems as a Sales Analyst at Gardyn. Beyond research, Nafisa is a Bangabandhu Innovation Grant 2023 recipient and 1st Runner-Up at the Aam Bazar Pioneros 3.0 Business Competition, showcasing her entrepreneurial mindset. She is also a Red Belt in Goju Ryu Karate, reflecting her discipline and perseverance. Committed to engineering excellence and interdisciplinary innovation, Nafisa strives to develop cutting-edge solutions in energy sustainability and resource efficiency.

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Nora Vaughan, graduate student in Lehigh's earth and environmental sciences program

Nora Vaughan

nov223@lehigh.edu
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Jonathan Wallace, graduate student in Lehigh's earth and environmental sciences program

Jonathan Wallace

jfw222@lehigh.edu