Health care management, also known as health care administration, encompasses a wide range of jobs in a variety of organizations. Health care managers are involved in the delivery of health care and the development of public policy regarding financing of and access to care. It is a field that has evolved over the last 50 years and continues to evolve as the health care delivery system changes. Health care managers work for organizations and individuals, from physician groups to hospitals, insurance companies and government agencies. Their roles are diverse as well, ranging from line supervisors to directors and middle managers to executives.