Bryan Kanietzko is the writer behind the popular comic series Avatar: The Last Airbender: The Promise. He's known for his work in the fantasy and adventure genres.
Michael Dante DiMartino (born July 18, 1974) is an American animation director, author and best known (along with Bryan Konietzko) as the co-creator, executive producer, and story editor of the animated TV series Avatar: The Last Airbender and The Legend of Korra, both on Nickelodeon.
Source: [Michael Dante DiMartino](https://en.wikipedia.org/wiki/Michael_Dante_DiMartino) on Wikipedia