Satoshi Takeda was the CEO of Takeda Industries, Japan's largest renewable resources company, and also serves as Emily Thorne and Aiden Mathis's mentor in the art of revenge. For reasons that are not entirely known, he seems extremely determined to keep Emily on her "righteous path" of vengeance. He trained her and Aiden (and possibly others) at a "revenge school" on Rebun Island in Hokkaido, Japan.