From Halopedia, the Halo wiki
Jeff Wilson is a sound designer and dialogue editor for American-made video games and movies. He has worked on such notables as Goldeneye: Rogue Agent and Medal of Honor: European Assault, as well as movies such as O-Negative and Rise and Fall of the Black Velvet Flag. Before he worked on these, though, he was hired as a (professional) tester for Halo: Combat Evolved. Before that he worked as a programmer, working on the game Ultima VII: The Black Gate in 1992.