Bryan Konietzko was the co-creator of the Nickelodeon animated series that ran between what years?
Bryan Konietzko:  He is best known, together with Michael Dante DiMartino, as the co-creator and executive producer of the animated series "" and "The Legend of Korra". The Legend of Korra: The Legend of Korra is an American animated television series that aired on the Nickelodeon television network from 2012 to 2014.
2012 to 2014