Mamie Gummer is an American actress best known for her role as Lila Wittenborn in the 2007 feature film Evening; and as Sally Smith Adams in the HBO mini-series John Adams, in 2008.
She also played the starring role of Mina - an ambitious infectious disease resident who's come to the jungle hoping to discover the next Ebola virus - in the medical drama series Off the Map, in 2010.
Gummer made her New York stage debut in 2005, starring opposite Michael C. Hall in the Roundabout Theatre production of Noah Haidle's Mr. Marmalade, directed by Michael Greif, which earned her a Theater World Award.
She also starred with Kate Burton and Tony Goldwyn in Theresa Rebeck's The Water's Edge, directed by Will Frears at NYC's Second Stage Theatre, for which she received a Lucille Lortel nomination for Outstanding Featured Actress, and in a revival of The Autumn Garden by Lillian Hellman at the Williamstown Theater Festival.
In spring 2008, Gummer made her Broadway debut in Les Liaisons Dangereuses, opposite Laura Linney. In 2009 she starred opposite Maggie Gyllenhaal and Peter Sarsgaard in the Broadway production of Uncle Vanya.
In film, Gummer appeared on screen in Evening with an all star ensemble that included Claire Danes, Patrick Wilson, Meryl Streep and Vanessa Redgrave.
She was also featured in Ang Lee's Taking Woodstock; Lasse Hallström's The Hoax with Richard Gere and Hope Davis; in Kimberly Peirce's Stop Loss with Ryan Phillippe and Joseph Gordon-Levitt; and in Loss of a Teardrop Diamond with Bryce Dallace Howard.
Gummer can also be seen in The Lightkeepers, opposite Richard Dreyfus and Blythe Danner, in Jeff Lipsky's Twelve Thirty and in John Carpenter's The Ward, opposite Amber Heard.
On television Gummer appeared in the Emmy and Golden Globe-winning miniseries John Adams for HBO, with Paul Giamatti and Laura Linney.
She also had a starring role as Emily Owens, a first-year surgical intern at Denver Memorial Hospital who is ready to put her high school days behind her, in the medical drama television series Emily Owens, M.D., from 2012-2013.
A Native New Yorker, Gummer graduated from Northwestern University and also studied theatre at the British Academy of Dramatic Arts. She is the daughter of actress Meryl Streep and the older sister of actress Grace Gummer.