Terry O'Quinn might better be known to lots of people as John Locke! The mysterious guy in the famous series 'Lost'.
Terry O'Quinn is an Irish-American actor ... he was born in Michigan in 1952!
I never saw him in series or movies before Lost, but truns out his acting career started in 1970's!
He starred in a few films & took up a few roles in series like Miami Vice, Star Trek: The Next Generation, The New Twilight Zone & Homicide: Life on the Street. He also guest starred a few times on The X-Files & Alias.

But his most notable character is the current one as John Locke.
O'Quinn will appear in a the coming weeks in a new series 'Masters of Science Fiction' in the episode entitled 'The Awakening'.
As for his personal life, O'Quinn has been married for 25 years ... he has two sons, Oliver and Hunter.

I like the character of John Locke; he's so mysteruious & seems to know lots of stuff ... he's not your usual Joe!
I think he's still got a lot to give in Lost ... he still has an important part to play in Season 4 ... i'm not sure if it's going to be good or bad ... but i have a feeling that there's still a lot to see from Locke!