Wikia

David Scully is the voice actor for Sergeant Avery J. Johnson throughout the Halo series. He also voiced many of the Elites. His other credits include Nemesis in Mechassault 2: Lone Wolf and Douglas Holiday in F.E.A.R.(First Encounter Assault Recon) and the expansion F.E.A.R. Extraction Point. Interestingly enough, Scully has also done a voice-over with Jen Taylor, the voice of Cortana, in the PC game Aliens versus Predator 2.

In addition to his work as a voice-actor, Scully is also a comedian, often using his wide vocal range to do various impressions or moods in his routine. He joined the cast of the long-running Seattle-area local television sketch comedy show Almost Live! during its final seasons in the late nineties.