Weaver arrived at County General as Chief Resident and later became an attending physician. She was promoted to Chief of Emergency Medicine and finally Hospital Chief of Staff. Her administrative position often forced her to make unpleasant decisions that drew hostility from her fellow physicians, as when she fired Jeanie Boulet in Season 4. She is often the villain in many episodes, prioritizing herself and her career over the well-being of other ER workers and even patients. Her behavior is often hypocritical, condescending, and arrogant.