Well, he has a past relationship with Bethesda, and they've managed to pull in some great actors for voice work in the past.
At any rate, I'm fairly certain that the Ravenrock Second Councilor Adril Arano is voiced by him, but I can't find anything that confirms this. He's not credited for it, and Bethesda didn't say anything about it.
That's not really all that strange concerning voice work, especially small parts. As far as I know, you only deal with him in a single quest line. It's worth doing early on as well, I won't spoil it, but you should finish up this quest as soon as you can.
You'll have to do a small quest for the Captain of the Guard before he'll give you the quest line though. I'm not certain, but you may also have to do a quest that involves the mine before it will trigger as well. It provides something very useful to have in the time you'll spend on the island.
Still, I'm pretty sure, but Google leads only to rumors, IMDB has no listing on his page, and the internet has no record of this.
It was pretty cool running into him in another Elder Scrolls game. I'm not 100% sure it's him though, but I'd be pretty surprised if it isn't.
Can anyone supply a solid confirmation that it's him? I've come up dry so far.