Question: Bryan Konietzko was the co-creator of the Nickelodeon animated series that ran between what years?
Context: The Legend of Korra is an American animated television series that aired on the Nickelodeon television network from 2012 to 2014.  It was created by Bryan Konietzko and Michael Dante DiMartino as a sequel to "", which aired from 2005 to 2008.  Animated in a style strongly influenced by anime, the series is set in a fictional universe in which some people can manipulate, or "bend", the elements of water, earth, fire, or air.  Only one person, the "Avatar", can bend all four elements, and is responsible for maintaining balance in the world.  The series follows Avatar Korra, the reincarnation of Aang from the previous series, as she faces political and spiritual unrest in a modernizing world. The Legend of Korra comics are a continuation of the Nickelodeon animated television series of "The Legend of Korra", created by Michael Dante DiMartino and Bryan Konietzko.  It is set right after the series finale, "The Last Stand." Michael Dante DiMartino (born July 18, 1974) is an American animation director best known as the co-creator, executive producer, and story editor of the animated TV series "" and "The Legend of Korra", both on Nickelodeon.  He was born in Shelburne, Vermont.  He studied at the Rhode Island School of Design with Bryan Konietzko, with whom he created "Avatar."  Before "Avatar," Mike worked for twelve years at Film Roman, helping to direct "King of the Hill", "Family Guy", and "Mission Hill" in addition to his own animated short, "Atomic Love", which was screened at a number of high-profile film festivals.  The dedication to his father's memory can be seen in the last episode of "Avatar: The Last Airbender".  In a 2010 interview the president of Nickelodeon, Cyma Zarghami, confirmed that DiMartino and Konietzko were developing a new series for the network, called "The Legend of Korra".  The series premiered on April 14, 2012, running 12 episodes for the first book "Air" and 14 for the second book "Spirits", which premiered on September 13, 2013 to 2.60 million viewers in the U.S., then the third book "Change" and the fourth and final book "Balance" of 13 episodes each. Sokka (索卡 , Suǒ Kǎ ) is a fictional character in Nickelodeon's animated television series "" and its sequel series "The Legend of Korra".  The character, created by Michael Dante DiMartino and Bryan Konietzko, is voiced by Jack DeSena in the original series and by Chris Hardwick in the sequel series.  In the live-action film adaptation "The Last Airbender", he is portrayed by Jackson Rathbone. Tenzin (丹增 , Dān Zēng ) is a major character in Nickelodeon's animated television series "The Legend of Korra", which aired from 2012 to 2014.  The character and the series, a sequel to "", were created by Michael Dante DiMartino and Bryan Konietzko.  He is voiced by J. K. Simmons.  Tenzin's father, Aang, was the Avatar who preceded Korra and kept world peace by preventing the Fire Nation from destroying the Earth Kingdom during the 100-year war, which occurred about seventy years before the beginning of "The Legend of Korra".  Tenzin’s mother, , greatly assisted Aang in his efforts to save the Earth Kingdom from destruction.  Tenzin is the youngest of the three offspring of Aang and Katara. Book Four: Balance is the fourth and final season of the animated television series "The Legend of Korra" by Michael Dante DiMartino and Bryan Konietzko.  It consists of thirteen episodes ("chapters"), all animated by Studio Mir.  The episodes are made available on the Nickelodeon website and other online outlets each Friday beginning on October 3, 2014.  Critical reception of "Book Four", as of the series in general, was positive. The third season of the animated television series "The Legend of Korra", titled Book Three: Change, was created by Michael Dante DiMartino and Bryan Konietzko, and consists of thirteen episodes ("chapters"), all animated by Studio Mir.  The season began airing on Nickelodeon in the U.S. on June 27, 2014.  After leaked episodes and following declining ratings, the series stopped airing on Nickelodeon after episode 8 on July 25, 2014.  Episodes 9 to 13 of "Book Three" were subsequently made available on the Internet weekly through Nickelodeon's website and on digital download platforms. The Avatar: The Last Airbender comics are a continuation of the original Nickelodeon animated television series, "", created by Michael Dante DiMartino and Bryan Konietzko.  There is also a continuation of "The Legend of Korra" in comic form. Bryan Konietzko (born June 1, 1975) is an American animation director, writer, producer and musician.  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" is an American animated television series created by Michael Dante DiMartino and Bryan Konietzko.  A sequel to "", the series first aired on Nickelodeon in 2012.  Like its predecessor, the series is set in a fictional world inspired by Asian and Inuit cultures, and inhabited by people who can manipulate the elements of water, earth, fire or air through an ability called "bending."  One person, the "Avatar," has the ability to bend all four elements.  Reincarnating in turn among the world's four nations, the Avatar is responsible for maintaining peace, harmony, and balance in the world.  Korra, the series' protagonist, is the next incarnation of the Avatar after Aang of "Avatar: The Last Airbender".  Four seasons with a total of 52 episodes have aired.
Answer: 2012 to 2014