John Kellerman is a former Delta Force member and current CIA contractor. Kellerman is the leader of the three-man unit which abducts Brian Finch in "Brian Finch's Black Op" and puts his NZT-enhanced skills to use. In keeping with the "Ferris Bueller" theme, Brian nicknamed him 'Rooney' in the absence of other information.

Kellerman was double-crossed and killed by Kyle Hollinger and Miklos Petrov, who later turned on one another.