Passage of the Occupational Safety and Health Act in 1971 represented a major milestone for occupational and environmental medicine. Creation of the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH) flowed directly from the legislation, and the specialty of occupational medicine entered a new era. As the 25th anniversaries of OSHA and NIOSH are celebrated, consideration of the future of the specialty of occupational and environmental medicine seems timely. In this lecture, an expanded role for the specialty is proposed, based on an analysis of the forces shaping the practice of public health and the opportunities that these forces present. This analysis suggests considering the concept of a "Chief Health Officer" serving the broad health needs of the workplace.