Roger Trenton was one of the members of Oversight. His codename was Atlas.
He went to the meeting in "Fair Trade". When the members were alerted that Nikita is near, he escaped.
In "Sanctuary" he met with Madeline Pierce, Bruce Winnick and David Collins to discuss about Nikita. They have decided that the best option is the "Clean Sweep". Patrick Miller and some other men attacked the members of the Oversight to blackmail Amanda into releasing Percy.