Marie Brennan is the pseudonym of Bryn Neuenschwander, an American fantasy author. Her works include Doppelganger, its sequel Warrior and Witch, and numerous short stories. Her third novel, Midnight Never Come, was published on 1 May 2008 in the United Kingdom, and 1 June 2008 in the USA. It received a four star-review from SFX Magazine.
As an undergraduate at Harvard University, Neuenschwander served as co-chair of the Harvard-Radcliffe Science Fiction Association. After graduating from Harvard, she pursued graduate studies at Indiana University, studying folklore and anthropology; in 2008 she left graduate school without completing her PhD, in order to pursue writing full-time.