Gravesen is an agent of some authority in Sector Seven. He's no nonsense, and he means business.
He's also the most secretive person in the world, as he blacks out his face and distorts his voice. No one knows what he looks like. Not even Agent Simmons. Not even his own mother.
Sector Seven ARG game
Agent Gravesen came around after Agent Powers
totally screwed up was reassigned following the Agent X/Rebecca Howards leak. He continued to monitor operations, such as the tracking of N.B.E.-23, and updated Agent Simmons on those operations all the while leaving people unable to see his true features.