ER is an American medical drama

Medical drama

A medical drama is a television program, in which events center upon a hospital, an ambulance staff, or any medical environment.In the United States, most medical episodes are one hour long and, more often than not, are set in a hospital. Most current medical Dramatic programming go beyond the...

 television series created by novelist Michael Crichton

Michael Crichton

John Michael Crichton , best known as Michael Crichton, was an American best-selling author, producer, director, and screenwriter, best known for his work in the science fiction, medical fiction, and thriller genres. His books have sold over 200 million copies worldwide, and many have been adapted...

 that aired on NBC

NBC

The National Broadcasting Company is an American commercial broadcasting television network and former radio network headquartered in the GE Building in New York City's Rockefeller Center with additional major offices near Los Angeles and in Chicago...

 from September 19, 1994 to April 2, 2009. It was produced by Constant c Productions and Amblin Entertainment

Amblin Entertainment

Amblin Entertainment is an American film and television production company founded by director and producer Steven Spielberg and film producers Kathleen Kennedy and Frank Marshall in 1981. Amblin is only a production company, and has never distributed its own movies, nor has it fully financed its...

, in association with Warner Bros. Television

Warner Bros. Television

Warner Bros. Television is the television production arm of Warner Bros. Entertainment, itself part of Time Warner. Alongside CBS Television Studios, it serves as a television production arm of The CW Television Network , though it also produces shows for other networks, such as Shameless on...

. ER follows the inner life of the emergency room (ER) of fictional County General Hospital in Chicago, Illinois, and various critical issues faced by the room's physicians and staff.