From Heroes Wiki
Paula Newsome is the American stage, film, and television actress who portrays Dr. Witherson.
Paula has appeared in number of television roles in a medical role, from Law & Order and Chicago Hope to the more recent ER and CSI. In 2003, she had a recurring role as "Kathy Wolf" on the series The Lyon's Den, which was canceled at the half-season mark. Recently, she appeared as the "bereavement liaison", "Linda", in the hit independent film Little Miss Sunshine, and had a recurring role in the television show Women's Murder Club, as well as a role as "Dr. Callie Langer" on FlashForward. Following Heroes, Paula has appeared in the television shows Parenthood, The New Adventures of Old Christine, Navy NCIS: Naval Criminal Investigative Service, and Women's Murder Club. She also appeared in the films Things We Lost in the Fire and Reign Over Me.