Dr. Nancy Snyderman has stepped down from her post as NBC’s chief medical editor, following a controversy that erupted last fall when she broke a self-imposed quarantine after returning from covering the Ebola outbreak in Liberia.

Dr. Snyderman drew criticism in October when she was seen in public in New Jersey days after promising to quarantine herself for 21 days. While in Liberia, she had worked with Ashoka Mukpo, a camerman who had contracted the Ebola virus.

After an extended absence from television, Dr. Snyderman returned to the air in December, but the incident tainted her relationship with NBC, according to a person close to Dr. Snyderman.

In a statement Thursday, Dr. Snyderman said that she was leaving NBC to take a faculty position at a “major U.S. medical school.” Dr. Snyderman, who had worked for NBC for nine years, previously worked as a consumer education executive at Johnson & Johnson and as a medical correspondent for ABC.