>>18156919ER is an American medical drama television series created by Michael Crichton that aired on NBC from September 19, 1994, to April 2, 2009, with a total of 331 episodes spanning 15 seasons. It was produced by Constant c Productions and Amblin Television, in association with Warner Bros. Television. ER follows the inner life of the emergency room (ER) of Cook County General Hospital, a fictionalized version of the real Cook County Hospital, in Chicago, and the various critical professional, ethical, and personal issues faced by the department's physicians, nurses, and staff.[1]