Mare Winningham is an American actress best known for her award-winning role as the title character in the 1995 feature film Georgia.
She is best known to television viewers for her recurring roles as Dr. Amanda Lee in the 5th season of medical drama ER; and as Susan Grey, Meredith's stepmother, in the 2nd and 3rd seasons of Grey's Anatomy.
She also starred as Ida Corwin in the 2011 period drama television mini-series Mildred Pierce, based on the James M. Cain novel of the same name.
For her performance in TNT's George Wallace, she received an Emmy Award as well as Golden Globe and SAG Award nominations. Mare also received an Emmy Award for Amber Waves and has been Emmy-nominated for the Hallmark Hall of Fame presentations of Love is Never Silent and The Boy's Next Door.
Additionally, she starred in such telefilms and mini-series as Off The Minnesota Strip, Helen Keller: The Miracle Continues, Everything that Rises, Eye on the Sparrow and The Thornbirds.
In 2003, Mare made her television series debut in David E. Kelley's The Brotherhood of Poland, New Hampshire and has since recurred on shows such as Grey's Anatomy and 24.
She received a Daytime Emmy Nomination for her performance in Showtime's Maldonado Miracle and starred in The Magic of Ordinary Days for the Hallmark Channel.
For her performance in the feature film Georgia, Mare garnered Academy Award and SAG Award nominations and an Independent Spirit Award for Best Supporting Actress.
Her other feature credits include Brothers, Swing Vote, Wyatt Earp, St. Elmo's Fire, Turner and Hooch, Made In Heaven, One Trick Pony, The War, Miracle Mile and Shy People.