An interview with Gainax staff, namely Hiroki Yamaga, Yasuhiro Takeda, Kazuya Tsurumaki, Hiroki Sato, and Yoshiyuki Sadamoto, that touches on working with US companies, the differences between American/Japanese conventions, and their personal favorite titles.
Too, this article offers a funny opportunity to quote mine;
“[I think where] Gainax is better than Disney [is that after Disney created Mickey Mouse, they created titles that belonged to other people.]” -Yoshiyuki Sadamoto