Geisinger is a physician-led health system comprised of approximately 30,000 employees, including nearly 1,600 employed physicians, 13 hospital campuses, two research centers, and a 583,000-member health plan Geisinger is nationally recognized for innovative practices and quality care. Geisinger serves more than 3 million people in central, south-central and northeast Pennsylvania and also in southern New Jersey with the addition of AtlantiCare.