Clive R. O'Brian

O’Brian is the representative of the BSAA, which (at the time Revelations takes place) is a private, non-governmental organization that fights against biohazard experiments, bioterrorism and B.O.W.s He’s the commander of the operation led by Jill, Parker, Chris and Jessica.

Trivia
O'Brian almost resembles Bill Murray in Ghostbusters: The Video Game