Nason started the WorkWISE program in 1997, serving the employee health needs of small and large businesses throughout the Penquis region.

Certification in occupational health is recognized as an indicator of expertise and leadership and represents a broad knowledge of the discipline and its application to promote the health and safety of workers. The COHN/CM credential is associated with a level of practice that meets high standards and contributes effectively to both management and workers' goals for a safe and healthy workplace.

Eligibility criteria includes successful completion of the American Board for Occupational Health Nurses's national examination, as well as the ability to demonstrate continued OHN practice and current knowledge gained through continued education.

Approximately 6,800 certified occupational health nurses are in active practice, and about 65% of the nurses employed in occupational health seetings are board certified.