The National Institute of Environmental Health Sciences (NIEHS) conducts research into the effects of the environment on human disease, as one of the 27 institutes and centers of the National Institutes of Health (NIH). The mission of NIEHS is to discover how the environment affects people in order to promote healthier lives. NIEHS is a global leader in the field of environmental health sciences, and its success requires the highest standards of stewardship and a solid foundation of supportive strategies, resources, and training.