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Much of the work carried out by DTT is in support of the National Toxicology Program (NTP), an interagency partnership of the Food and Drug Administration, National Institute for Occupational Safety and Health, and NIEHS.

The Health Assessment and Translation (HAT) group (formerly Office of Health Assessment and Translation (OHAT)) serves as an environmental health resource to the public and to health research and regulatory agencies.

  • Conducts technical assessments focused on understanding the potential for adverse effects on human health by agents, substances, mixtures, or exposure circumstances (collectively referred to as “substances”). These evaluations can lead to NTP opinions on whether these substances may be of concern given what is known about current human exposure levels.
  • Organizes workshops or state-of-the-science evaluations to address other issues of importance in environmental health sciences.


Andrew A. Rooney, Ph.D.
Andrew A. Rooney, Ph.D.
Acting Chief, Integrative Health Assessments Branch
Tel 984-287-3178
Fax 301-480-3299
[email protected]
P.O. Box 12233
Mail Drop K2-04
Durham, NC 27709