The Department of Health and Human Services, along with National Institute for Occupational Health and Safety and the Center for Disease Control have begun a concerted effort to fill the knowledge gaps in defining the hazards, exposures, and risks involved with handling nanomaterials. Investigators are working to provide guidance for those working in the field of nanotechnology to address the risks associated with working with animals exposed to various engineered nanomaterials, epidemiologic research, and exposure limits.  The National Institute for Occupational Safety and Health has summarized its progress and recommended risk management strategies for those in the field.