Nina Sharp (Blair Brown)Nina Sharp is the executive director and Chief Operating Officer of Massive Dynamic, and a confidante of the corporation's visionary founder William Bell. Based in New York, Massive Dynamic is multi-billion dollar corporation with a hand in such enterprises as robotics, pharmaceuticals, and weapons testing, with an estimated worth of around $50 billion.FBI agent Olivia Dunham first meets Nina as part of an investigation that involves one of its employees, and although Nina is helpful to a point, she also seems to know that greater forces are at work in the world than Olivia can conceive of.Background: Nina tells Olivia Dunham that she was a runner for most of her life before joining Massive Dynamic in 1992. She professes to be grateful to the corporation for a number of reasons, the most significant being that medical equipment developed by Massive Dynamic provided her doctors with an lifesaving early cancer diagnosis.