British actor best known to Americans as Lee Adama on the 2000's version of Battlestar Galactica. He is well known in his home nation of the UK; and he had a starring role as DS Matt Devlin on Law & Order: UK.
The incomplete list of works Mr. Bamber has had either a starring or guest role in:
Horatio Hornblower: Made an appearance in five of eight episodes, and his Archie Kennedy was one of the most beloved characters.
Unintentionally. When BBC America realized that it aired three of his shows all at once (Law and Order UK, Outcasts, and Battlestar Galactica), they decided to just run with it and ran an ad that jokes that BBC stood for "Bamber Broadcasting Corporation"—and he's going to be starring on yet another BBC Series The Smoke.
Thanks to him starring on two TNT shows, Perception and Monday Mornings, this has inadvertently happened again.
Breakout Character: Young sailor Archie Kennedy was meant to only appear in the first episode of Hornblower. However, Jamie Bamber's portrayal was so well-liked by the crew and the character was found to be a great foil to Hornblower's silent hero that works amazingly on-screen, that Archie was written in other parts of the miniseries. Rumour has it that he was only written out later because of Executive Meddling from the Forrester estate.
British Accents: His natural accent is London-based English. He can adopt an Irish accent as well. (Unsurprising, because his mother is Irish.)
Cunning Linguist: Speaks fluent French and Italian (he studied them for his Modern Language degree), can pull off an American accent so convincingly that many people are genuinely shocked to learn that he's British, and can even give his British accent an Irish tinge (as he did on Law and Order UK).
Dawson Casting: When he was 25, he was cast as a teenage midshipman Archie Kennedy. Other actors were also older than their characters, so it was fairly convincing.
Fake Nationality: Subverted Trope. He's adopted a nearly flawless American accent for most of his US TV appearances and used a slight Irish brogue while on Law & Order: UK But given that his father is an American and his mother is Irish — thus explaining his ease with adopting both accents — that automatically grants him both US and Irish citizenship even though he was born in London.
Fan Community Nicknames: A vocal community of his fans call themselves Bamber Bunnies or members of "Team Bamber", and fans of his character Archie Kennedy from Horatio Hornblower are known as Crumpeteers.
Fan Disservice: Makeup and whatnot have done a very effective job of making this remarkably handsome man look like hell:
Adama's weight gain in Season 3 of BSG.
Zombie makeup in Ghost Whisperer
An unknown medical condition in House.
At the ending of the premier episode of The Smoke, his character drunkenly pulls his pants down. . .to reveal the severe burn injuries he suffered during the prologue.
Mr. Fanservice: With the exception of the abovementioned examples, he's been portrayed as a lust object in basically everything he's starred in.
Old Shame: His apparent feelings about the movie Ghost Rig, given a YouTube clip depicting his hilariously embarrassed reaction when it's mentioned to him. Not even the fact that he met his wife while filming it can change his opinion that it was "terrible".
Older than They Look: At 25, he was able to convincingly play a 17-year-old Archie Kennedy in Hornblower. Even now at 40 (which to be fair, is still relatively young), he can pass for someone at least 5 years younger.
Ooh, Me Accent's Slipping: He does an admirable job with accents, but he himself said that he could hear whenever he had slipped, and that it had happened especially during the beginnings of Battlestar Galactica. Additionally, public opinion seems to be that despite being from London, he's having trouble maintaining a working-class accent on The Smoke, as it's a distinct change from his natural upper-class one.
Shirtless Scene: Nearly everything he appears in has him shirtless at one point or another.
His best known one is the famous towel scene from Battlestar Galactica (Reimagined).
His appearance on House even seems to lampshade this—he's shirtless, but his skin is peeling off
He posed naked◊ in an ad campaign for PETA to protest the bearskin caps used by the Queen's Guard. (Bearskin, bare skin, get it?)
What Beautiful Eyes: He has gorgeous blue eyes. There will be some close-up shots to show them properly. His stint on Monday Mornings featured numerous ones in an apparent reference to this trope.