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Your Environment. Your Health.

Office of the Scientific Director

Division of the National Toxicology Program

The NIEHS Division of the National Toxicology Program (DNTP) Office of the Scientific Director provides scientific leadership and operational support for DNTP. As a team-based scientific organization, DNTP seeks to improve public health through the development of data and knowledge that are translatable, predictive, and timely. Offices supporting the Scientific Director:

  • Coordinate acquisition and allocation of fiscal, contracted and administrative resource to operational units of the Division.
  • Foster a productive environment for research, testing, and analysis activities.
  • Promote interactions and coordination among DNTP and NIEHS staff.
  • Promote activities intended to increase interactions among DNTP scientific staff including seminars, monthly science forum, and other programs.
  • Serve as focal point for the DNTP Training Fellowship Program.
  • Serve as liaison with NIH, other federal agencies, and stakeholders regarding DNTP activities.

Much of the work carried out by DNTP is in support of the National Toxicology Program (NTP), an interagency partnership of the Food and Drug Administration’s National Center for Toxicological Research, National Institute for Occupational Safety and Health, and National Institute of Environmental Health Sciences (NIEHS). DNTP activities supporting NTP include toxicology testing, laboratory research, and literature-based assessments. It also includes oversight of NTP communications, databases, website, advisory groups, and the peer review of draft NTP products.

Scientific Director

The Scientific Director provides policy, organizational, and scientific leadership for DNTP as well as planning, managing, and coordinating its internal and external activities. The Scientific Director ensures that the resources provided to the Division in support of the NTP and NIEHS missions are used to bolster a strategic and impactful portfolio of scientific effort.

Brian Berridge
Brian R. Berridge, D.V.M., Ph.D., D.A.C.V.P.
Scientific Director, Division of the National Toxicology Program;
Associate Director, National Toxicology Program
Tel 984-287-3111
P.O. Box 12233
Mail Drop K2-02
Durham, N.C. 27709

Brian Berridge, D.V.M., Ph.D., D.A.C.V.P., joined the NIH in January of 2018 as the Scientific Director of the DNTP at NIEHS, and the Associate Director of the NTP. Previous to NIEHS, Berridge spent 17 years in the pharmaceutical industry in varying roles as a toxicologic pathologist at Eli Lilly in Indianapolis, Indiana, and GlaxoSmithKline in Research Triangle Park, North Carolina.

Berridge is an Oklahoma State University-trained veterinarian with residency and Ph.D. training from Texas A&M University. He is a Diplomate of the American College of Veterinary Pathologists with post-doctoral training in comparative cardiovascular pathology from the Texas Heart Institute in Houston, Texas. His areas of interest and expertise include toxicologic and comparative pathology with particular interest in cardiovascular and renal pathology. He is a veteran of the U.S. Air Force where he was a non-commissioned officer trained as a histopathology and electron microscopy technologist. Berridge is currently active in various consortium efforts aimed at advancing innovative approaches to modeling human pathobiology that improve the translation of preclinical research to clinical outcomes and advance our ability to characterize human cardiovascular health hazards.

Since joining NIEHS, Berridge has worked to advance public health and toxicology in ways that are translatable, predictive, and timely. He has broadened DNTP’s traditional focus on studying specific chemicals to include assessing how chemical exposures affect the development of human disease. Initiatives have been introduced to concentrate research and translation efforts in cardiovascular hazard assessment, developmental neurotoxicity, and carcinogenicity testing. These health effects innovations provide opportunity for working across a continuum of knowledge – using contemporary tools such as literature analysis, animal studies, in vitro systems, and in silico or computational analytics – to better understand how environmental exposures contribute to diseases in these systems. These efforts complement traditional strategic areas of study within DNTP that are agent-focused and for which DNTP scientists have led research, testing, and literature-analysis activities in support of the NTP since 1978.

OSD scientists contribute to NTP report and monograph series and publish findings in the NIEHS report series and peer-reviewed scientific literature. Staff publications can be viewed on the webpage.


Michelle J. Hooth, Ph.D.
Michelle J. Hooth, Ph.D., D.A.B.T.
Acting Deputy Director for Program Operations, Division of NTP;
Director, Office of Program Operations

Tel 984-287-3140
Fax 919-541-4255
Mary S. Wolfe, Ph.D.
Mary S. Wolfe, M.S., Ph.D.
Acting Deputy Director for Policy and Communication, Division of NTP;
Director, Office of Policy, Review, and Outreach;
Acting Director, Office of Workforce Development and Operations

Tel 984-287-3209
Fax 301-451-5759

Support Staff

Tracy Briscoe
Tracy D. Briscoe
Administrative Specialist

Tel 984-287-4035
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