Jeff Steitzer is an actor who has provided the voice for two of the NOLF video games. Jeff provided the voice for Baron Archibald Dumas in The Operative: No One Lives Forever. Jeff also provided the voice for Dr. Schenker, the H.A.R.M. Bots and Super Computer in No One Lives Forever 2: A Spy in H.A.R.M.'s Way.
You can also hear Jeff's voice in the HALO series and Aliens vs Predator 2.