This was why I was skeptical when I heard he was going to the lead in a drama series, but he does a brilliant job. All I had every seen him in was "Blackadder' and "A Bit of Fry and Laurie".
All of the stuff I've seen him in he's had an American accent. And I haven't exactly googled him ^^;; I just watch House when its on and there's nothing else on.