Jeffrey Kafer is a career professional playtester. Occasionally, he also contributes to voice extras for the games he tests. He has been involved in several video game series over the years, including MechWarrior 4: Mercenaries, MechWarrior 4: Vengeance, MechAssault, MechAssault 2: Lone Wolf, Crimson Skies: High Road to Revenge, and Halo: Combat Evolved.