what was her role in the series?
Her husband's mother in the flashback scenes.
Carrie Preston
Preston has worked on numerous projects with her husband, actor Michael Emerson, whom she married in 1998. Emerson played Ben Linus on television's "Lost", and Preston was a guest star in episode 20 of season 3, "The Man Behind the Curtain" as Ben's mother Emily in flashback scenes, though she and Emerson never shared scenes together. 
who is ben and why does he appear UNANSWERABLE what is the full name of this character who appears in the television series "lost"? Benjamin Linus what was his demeanour like in the series? Although extremely well-mannered, he has an impeccable ability to lie and manipulate the people around him. He often speaks in a low, emotionless monotone and his speech is with sarcasm or dry, mirthless jokes. He can also be petty and vindictive. who played this role? Michael Emerson can you name some of his other major roles? He played the role of William Hinks on "The Practice", Benjamin Linus on "Lost", Zep Hindle in the first "Saw" film, Cayden James on "Arrow" and Harold Finch on the CBS series "Person of Interest". who was the showrunner of the first series you mentioned? ABC where was it set? Boston who is the above mentioned actor married to? Carrie Preston is she also associated with the film industry? Yes, she is an American actress, producer, and director. has she ever acted together with her husband? Yes, in "Lost".
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Carrie Preston [SEP] Career
Preston has worked on numerous projects with her husband, actor Michael Emerson, whom she married in 1998. Emerson played Ben Linus on television's "Lost", and Preston was a guest star in episode 20 of season 3, "The Man Behind the Curtain" as Ben's mother Emily in flashback scenes, though she and Emerson never shared scenes together. The couple were featured in the 2004 comedy film "Straight-Jacket" and the 2008 feature film, "Ready? OK!". She appeared in several episodes of "Person of Interest" as Grace Hendricks, the former fiancée of Emerson's character, Harold Finch. Preston is co-owner of the production company Daisy 3 Pictures with James Vasquez and Mark Holmes.