wesleysgirl, Nick is on House! The beard is covering his face, but he was in the credits so it has to be him.
ETA Episode spoilers in comments and OMG, what an episode!
ETA2 Nick:
WG and I have a trilogy with Loose Id with two characters, Nick and John. I write John, she writes Nick. When we began the first book, we knew in our heads what they looked like but had to get it over to each other. I said John looked like Robert Carlyle (see icon) and she said Nick looked like Eyal Podell (see her icon in this thread). He was the man Angel turned on a submarine; Lawson.
And he was the husband in last night's episode.