Biography: From Wikipedia, the free encyclopedia. Hiromasa Yonebayashi (born 1973 in Ishikawa Prefecture, Japan), nicknamed Maro, is a Japanese animator and director for Studio Ghibli. Making his directing debut with them in the film The Borrower Arrietty, he became the youngest director of a Studio Ghibli film. Description above from the Wikipedia article Hiromasa Yonebayashi, licensed under CC-BY-SA, full list of contributors on Wikipedia.