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Exposure Research

Human Exposure & Atmospheric Sciences Staff

Marsha K. Morgan

Title: Research Environmental Health Scientist

EPA Division: Human Exposure and Atmospheric Sciences Division

EPA Branch: Exposure Measurements and Analysis Branch

Marsha’s research primarily focuses on quantifying human exposures to chemicals using urinary biomonitoring. Her current interest is conducting research that provides a better understanding of the quantitative relationships between urinary biomarkers and human exposures to non-persistent chemicals in residential settings.


  • United States Department of Agriculture (USDA) Graduate School’s Executive Potential Program, a one year leadership development program, Washington D.C. 2005
  • Postdoctoral Research Associate at the USEPA’s National Exposure Research Laboratory, Postdoctoral Research Program, RTP, NC 1998-2000
  • Ph.D., Animal Science-Environmental Toxicology (dual degree), Michigan State University, East Lansing, MI 1998
  • M.S., Environmental Health Sciences, East Tennessee State University, Johnson City, TN 1994
  • B.S., Pre-medicine Zoology, Ohio University, Athens, OH 1991

Professional Experience:

  • Research Environmental Health Scientist, EMAB, HEASD, NERL, ORD, USEPA, RTP, NC September 2000-present
  • Acting Associate Director for Health (detail), HEASD, NERL, ORD, USEPA, RTP, NC August 2010-August 2012
  • Acting Supervisory Physical Scientist (detail), EMAB, HEASD, NERL, ORD, USEPA, RTP, NC August 2007-December 2007
  • Research Scientist (detail), OSP, USEPA, Washington, D.C. November 2004-January 2005
  • Research Scientist (rotational assignment), OAQPS, USEPA, RTP, NC July 2004-September 2004
  • Environmental Health Scientist (Postdoctoral Research Program), EMAB, HEASD, NERL, ORD, USEPA, RTP, NC September 1998-August 2000

Professional Societies and Affiliations:

  • International Society of Exposure Science (ISES)
  • Government Councilor and Finance Committee Board member on the Board of Directors for the International Society for Exposure Science (ISES), 2009-2011

Select Awards and Honors:

  • USEPA Level III Scientific and Technological Achievement Award (STAA) for publishing a paper (first author) and book chapter (second author) that identified unique important routes of movement and pathways of human exposure in the residential environment; 2011
  • USEPA Level I Scientific and Technological Achievement Award (STAA) for publishing three important scientific papers, as first author, that identified the important sources, pathways, and routes of young children’s exposures to pesticides in their everyday environments; 2009
  • USEPA NERL Special Achievement Award for Supporting the Agency’s Mission for routinely interacting with OPP/HED scientists to provide technical assistance and regulatory support for their work to conduct risk assessments for pesticide products, review the safety of older pesticides, and evaluate potential new pesticides; 2009
  • ISES Joan M. Daisy Outstanding Young Scientist Award for outstanding contributions to the science of human exposure analysis by a young scientist; 2008
  • US EPA Children’s Environmental Health Excellence Award which recognizes science leaders for their contribution to the body of peer-reviewed children’s environmental health literature; 2007
  • USEPA NERL Special Achievement Award for the Children’s Exposure Team Supporting the Agency’s Mission for helping to complete an EPA report on ‘Important exposure factors for children: an analysis of laboratory & observational field data characterizing cumulative exposure to pesticides’; 2007
  • USEPA NERL Special Achievement Award for Anticipating Future Environmental Issues: Advancing the Area of Cumulative Risk which recognizes contributions as a scientific leader in identifying and responding to emerging environmental problems; 2006
  • US EPA ORD Honor (Bronze) Award for completion of an important children’s aggregate exposure study (CTEPP); 2005
  • US Department of Transportation’s Special Recognition Award by the Assistant Secretary of Administration for helping to complete the ‘Take Ten’ Pilot Fitness Program at DOT which promoted an organizational culture that was committed to the health of its employees by implementing a daily, 10-minute walking program; 2004

Select Presentations:

  • 10/12 – Morgan M, Starr J., Diep B, Burke K, and Walker R. Levels of pyrethroids, their metabolites, and bisphenol A in residential vacuum dust and drinking water in the Ex-R study. International Society of Exposure Science 22nd Annual Meeting, Seattle WA (presenter).
  • 10/11 – Yorita-Christensen K, Lorber M, Koch H, Kolossa M, and Morgan M. Population Variability of Phthalate Metabolite and Bisphenol A Concentrations in Spot Urine Samples Versus 24- or 48-hour Collections. International Society of Exposure Science 21st Annual Meeting, Baltimore MD.
  • 06/11 – MacMillan D, Zehr R, and Morgan M. LC/MS/MS of pyrethroids, their metabolites, and bisphenol A in solid food composites as a complement to biomonitoring. 59th American Society for Mass Spectrometry Conference on Mass Spectrometry and Allied Topics Denver, CO.
  • 05/11 – Morgan M, Sobus J, Starr J, MacMillan D, Boyd-Barr D, Tan C, and Sheldon L. A biomonitoring study designed to estimate human exposures to pyrethroid pesticides in residential settings using an exposure reconstruction framework. Session on Integrating the Sciences and Development of Methods, Approaches and Tools to Meet Emerging Exposure Needs in Chemical Regulation at the SETAC Europe and ISES Joint Special Session in Milan, Italy
  • 11/10 – Morgan M, Sobus J, Starr J, MacMillan M, Boyd-Barr D, and Sheldon S. Design and sampling methodology for a biomonitoring study estimating human exposures to pyrethroids using an exposure reconstruction approach. Society of Toxicology and Environmental Chemistry (SETAC) National Meeting, Portland OR

Select Publications:

  • Morgan M. Children’s exposures to pyrethroid insecticides at home: A review of available exposure measurement studies conducted in the United States. International Journal of Environmental Research and Public Health. 2012: 9: 2964-2985.
  • Christensen K, Lorber M, Koch H, Kolossa-Gehring, and Morgan M. Population variability of phthalate metabolites and bisphenol A concentrations in spot urine samples versus 24- or 48-h collections. Journal of Exposure Science and Environmental Epidemiology. 2012: 22: 632-640.
  • Morgan M, Jones P, Calafat A, Ye X, Croghan C, Chuang J, Wilson N, Clifton M, Figuerora Z, and Sheldon L. Assessing the quantitative relationships between preschool children’s exposures to bisphenol A by route and urinary biomonitoring. Environmental Science and Technology. 2011: 45(12): 5309-5316.
  • Egeghy P, Cohen Hubal E, Tulve N, Melnyk L, Morgan M, Fortmann R, and Sheldon L. Review Of Pesticide Urinary Biomarker Measurements from Selected US EPA Children’s Observational Exposure Studies. International Journal of Environmental Research and Public Health. 2011: 8(5): 1727-1754.
  • Morgan M, Sheldon L, Croghan C, Jones P, Chuang J, and Wilson K. The reliability of using urinary biomarkers to estimate children’s exposures to chlorpyrifos and diazinon Journal of Exposure Science and Environmental Epidemiology. 2011: 21(3): 280-290.
  • Sobus J, Morgan M, Pleil J, and Barr D. Biomonitoring uses and considerations for assessing human exposures to pesticides. Invited book chapter for the Hayes’ Handbook of Pesticide Toxicology, 3rd edition. 2010. 2000 p.

Published & Presented Research (1999-Present)

Contact Info:
Marsha Morgan
Human Exposure & Atmospheric Sciences Division
National Exposure Research Laboratory
US EPA Office of Research and Development
109 TW Alexander Drive
Research Triangle Park, NC 27709
Telephone: 919-541-2598
Email: morgan.marsha@epa.gov

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