Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Your Environment. Your Health.

Nigel J. Walker, Ph.D.

Nigel J. Walker, Ph.D., D.A.B.T.
Nigel J. Walker, Ph.D.
Acting Chief, Systems Toxicology Branch
Tel 984-287-3204
Fax 301-451-5596
P.O. Box 12233
Mail Drop K2-02
Durham, N.C. 27709

Nigel Walker, Ph.D., D.A.B.T., is the Acting Chief of the Toxicology Branch, in the Division of the National Toxicology Program at the National Institute of Environmental Health Sciences (NIEHS), part of the National Institutes of Health (NIH).

In this role he is involved in formulation, coordination, implementation, management and oversight of activities necessary to carry out the scientific goals of the National Toxicology Program (NTP), a Federal interagency program that generates, interprets, and shares toxicological information about potentially hazardous substances in our environment to provide the scientific basis for programs, activities, and policies that promote health or lead to the prevention of disease.

Walker has been at the NIEHS for over 20 years and during this time has led numerous initiatives understanding the potential toxicity and carcinogenicity of compounds under investigation by NTP including nanoscale materials, dioxin-like compounds, persistent organic pollutants, environmental/occupational mixtures, endocrine disrupting compounds, and botanical dietary supplements.

Walker has co-authored over 175 publications, including over 75 peer-reviewed technical reports on the toxicity and carcinogenicity of compounds studied by NTP.

He received his B.Sc. in Biochemistry from the University of Bath in the U.K. and his Ph.D. in Biochemistry from the University of Liverpool, U.K. and has been board certified as a toxicologist by the American Board of Toxicology since 2007.

Recent Publications

    to Top