Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted.  For more information, please see www.doi.gov/shutdown

Jennifer Brennan, Ph.D.


Jennifer (Jenny) is a Research Toxicologist at the USGS Columbia Environmental Research Center. She received her doctoral and master's degrees from University of California-Davis where she studied effects-directed analysis of bioactive phytochemicals and development of in vitro cell bioassays for endocrine-active substances. Presently, her research focuses on characterization of cell bioassays for endocrine-active substances and use of these bioassays in effects-directed analysis of endocrine-active substances from various locations within the Chesapeake Bay Watershed.


Ph.D. Agricultural and Environmental Chemistry, University of California-Davis, 2015
M.S. Avian Sciences, University of California-Davis, 2009
B.S. Biology (Magna Laude), James Madison University, 2006

Professional Experience

2015-present, Research Toxicologist, U.S. Geological Survey, Columbia Environmental Research Center, Columbia, MO
2010-2015, Research Assistant, Dept. of Environmental Toxicology, University of California-Davis
2006-2009, Research Assistant, Dept. of Animal Science, University of California-Davis
2007-2014, Teaching Assistant, Depts. of Chemistry, Environmental Toxicology, Science and Society, and Biological Sciences, University of California-Davis


2011-present, Society of Toxicology
2007-present, Society of Environmental Toxicology and Chemistry
2005-present, Iota Sigma Pi, Women's Honor Society in Chemistry