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