I agree that the voice sounds like his, but I'm pretty sure he'd be in the credits and the game would be in his bio (like Tachyon is). Yeah, I also did a double-take when I first heard it. The voice overs in this game a done pretty well imo, and the more the merrier.
Funny thing is, I remember back in the day contemplating whether a sound card would really improve my enjoyment of a game enough to make the investment worthwhile. Mind you, this was back when high-fidelity compter audio was considered allowing the PC to make more than one beep, let alone a beep in another tone (OMG!!1!).