"Avatar: The Last Airbender" was co-created and produced by Michael Dante DiMartino and Bryan Konietzko at Nickelodeon Animation Studios in Burbank, California. Animation work was done by the Korean animation studio DR Movie. According to Bryan Konietzko, the program was conceived in the spring of 2001 when he took an old sketch of a balding, middle-aged man and re-imagined the character as a child. Konietzko drew the character herding bison in the sky, and showed the sketch to Mike DiMartino. At the time, DiMartino was studying a documentary about explorers trapped in the South Pole.