Phillip Green

 worked in security for Perseus Corporation. He was assigned to deal with a hacker attack at Perseus' subsidiary company, Perseus Dynamics.

He and David Gordon, also in security, were interested in deflecting the UN's attention from Perseus' illegal project. They were suspicious of the Eighth Doctor's credentials when he arrived acting as an investigator for Conflict Management Oversight. Green and Gordon intended to plant evidence that rogue hackers in China were involved in the attack, but the Doctor discovered Perseus' illegal project. (PROSE: Thinking Warrior)