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The research in our lab has been advanced through the efforts of a large group of colleagues, including talented technical staff, students, postdoctoral fellows, and collaborators. Some current and former members of our lab are noted below. If you are interested in joining the lab, please contact us.

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Mark E. Hahn, Ph.D.

Senior Scientist

Mark obtained his Ph.D. in toxicology in 1988 from the University of Rochester School of Medicine and Dentistry. He came to WHOI in 1987 to conduct research in marine toxicology and the use of aquatic animal models for biomedical research.



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Sibel I. Karchner, Ph.D.

Research Specialist

Sibel Karchner received her Ph.D. in biology in 1992 from Texas Tech University. She has been at WHOI and a member of Mark Hahn's team since 1993. Her main research interests are regulation of gene expression in environmental adaptation, and evolution of genes involved in the organismal response to environmental stressors.



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Kallen R. Sullivan, M.S.

Research Assistant II

Kallen joined our lab in January 2022. She received her B.S. in Marine Biology in 2018 at University of St Andrews, St Andrews, UK. She completed her M.S. in Applied Marine and Fisheries Ecology in 2021 at University of Aberdeen, Aberdeen, UK.



Jordan Avery Pitt, B.S.

Ph.D. Student in the MIT-WHOI Joint Program in Oceanography and Oceanographic Engineering

Jordan Pitt's research focuses on the presence and effects of microplastics and nanoplastics in the marine environment. She is the recipient of an NSF Graduate Fellowship.


Directory: Jordan Pitt web page

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Diana G. Franks

Former Members of Our Lab