Question: How many years did Michael Dante DiMartino work for an American animation studio owned by Waterman Entertainment?
Sentence (from "Michael Dante DiMartino"): 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.
Relevant evidence: Yes