The Occupational Safety and Health Administration (OSHA) was established by the Williams-Steiger Occupational Safety and Health Act (OSH Act) of 1970, which took effect in 1971. OSHA's mission is to ensure that every working man and woman in the nation is employed under safe and healthful working conditions. Nearly every employee in the United States comes under OSHA's jurisdiction. The only exceptions are people who are self-employed, workers in mining and transportation industries (who are covered by other agencies), and most public employees. Thus, nearly every private employer in the United States needs to be cognizant of OSHA rules and regulations. OSHA is an administrative agency within the United States Department of Labor and is therefore administered by an assistant secretary of labor.