Within the Federal Government, most jobs are as Occupational Safety and Health Administration inspectors, who enforce U.S. Department of Labor regulations and impose fines. Within the U.S. Department of Health and Human Services, the National Institute of Occupational Safety and Health hires occupational health and safety specialists to offer companies help in evaluating safety without the risk of fines. Most large government agencies also employ occupational health and safety specialists and technicians who work to protect agency employees.
Most private companies either employ their own occupational health and safety workers or contract with them. Most contract work is done through consulting companies, but some specialists and technicians are self-employed.
In addition to working for governments, occupational health and safety specialists and technicians were employed in manufacturing firms; private general medical and surgical hospitals; private colleges, universities, and professional schools; scientific and technical consulting services; research and development in the physical, engineering, and life sciences; and electric power generation, transmission, and distribution. Insurance companies and technical consulting services also often employed specialists, whereas employment services and testing laboratories often employed technicians.
Source: Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2008-09 Edition