An image from The Legend of Korra, one of the productions that also features Bryan Konietzko.

Bryan Konietzko

June 1, 1975 — USA

Bryan Joseph Konietzko (born June 1, 1975 or May 26, 1976) is an American animator, writer, producer and director. He and Michael Dante DiMartino are best known as the co-creator and executive producer of the animated series Avatar: The Last Airbender and The Legend of Korra.

Description above from the Wikipedia article Bryan Konietzko, licensed under CC-BY-SA, full list of contributors on Wikipedia.