Neurosurgical Associates of Nebraska (NAN) is a private practice neurosurgery group offering personalized care for brain and spine disorders. Physicians George Greene, MD, John Hain, MD and Ric Jensen, MD are board-certified and neurosurgeons. In cooperation with The Nebraska Medical Center, the NAN partners offer post operative and other follow-up care in Norfolk and Fremont, Neb., and a half-dozen communities in Iowa.