TENka's president has been mentioned by a few people but it is unknown if he/she has appeared on screen. One theory is that he/she is the owner of The Hands during the interrogation of Kleya Smith. More outlandish theories say that The President is either Saisuke or Kleya's father.
Dr. Grace works for him, but it is unknown if there's other layers of management between them.
It is implied that the president tends to become angry enough to be dangerous, as indicated by Dimitri's comment, "it takes too many resources to operate the safe room and he wasn't too happy with your previous false alarm."