Aja Naomi King is an American actress. She began her career in guest-starring roles on television, and starred as Cassandra Kopelson in the short-lived CW medical comedy-drama Emily Owens, M.D..

In 2014, King began starring as Michaela Pratt in the ABC legal drama series How to Get Away with Murder, for which she received NAACP Image Award for Outstanding Supporting Actress in a Drama Series nomination in 2015. She also has starred in the films Four (2012) and Reversion (2015). In 2016, she portrayed Cherry Turner in the historical film The Birth of a Nation.

King appeared in several short films in the early period of her career. She made her television debut in 2010, as a guest star in the CBS police procedural Blue Bloods, and later appeared on Person of Interest, The Blacklist, and Deadbeat. She made her feature film debut in the 2011 independent film Damsels in Distress, as a minor character. Her big break came in 2012, when she was cast as new surgical intern Cassandra Kopelson and the series' primary antagonist, on the CW medical comedy-drama series Emily Owens, M.D. The series was canceled after a single season in 2013. She later starred in the Amazon Studios comedy pilot The Onion Presents: The News.

In 2013, King co-starred in two independent films. She played Abigayle, the daughter of Wendell Pierce's character, in the independent drama Four, released on September 13, 2013. Along with her castmates, she won a Los Angeles Film Festival Award for Best Performance by Cast for her role in this movie. She also appeared alongside Laverne Cox and Britne Oldford in the film 36 Saints. In 2014, she had supporting role in the romantic comedy The Rewrite, starring Hugh Grant and Marisa Tomei. The film was shot in 2013 but was released theatrically in the United States in 2015.

In early 2014, King had a recurring role as Ali Henslee in the ABC medical drama series Black Box, starring Kelly Reilly. The series was cancelled after a single season. In February 2014, she was cast as one of the lead characters in the ABC legal thriller How to Get Away with Murder, produced by Shonda Rhimes. The series stars Viola Davis as a law professor Annalise Keating. King plays the role of Michaela Pratt, one of the five lead students, alongside Jack Falahee, Alfred Enoch, Matt McGorry, and Karla Souza. The series premiered on September 25, 2014 with generally positive reviews from critics and 14 million viewers. King received her first NAACP Image Award nomination for her performance in series.

In 2015, King had her first the leading role in the science-fiction thriller Reversion. The film had limited theatrical release on October 9, 2015. Also in 2015, she was cast as the female lead in the historical drama film The Birth of a Nation, based on the story of the 1831 slave rebellion led by Nat Turner. The film also stars Nate Parker, Aunjanue Ellis, Gabrielle Union, and Armie Hammer. She played Nat Turner's wife, Cherry. The film premiered in competition at the 2016 Sundance Film Festival on January 25, 2016, and received positive reviews from critics. King's performance was also well received. Variety placed her in their list of one of the "Biggest Breakthrough Performances" at Sundance, writing that "King transforms herself from contemporary glamour girl to 19th-century slave in Nate Parker's festival smash. A harrowing scene late in the film opposite Parker as Nat Turner reveals a depth and range King has never been asked to deliver in her small screen work, and a potential new star is born." King has also been shortlisted as a possible contender for the Academy Award for Best Supporting Actress but did not receive a nomination. She received a NAACP Image Award for Outstanding Supporting Actress in a Motion Picture nomination for her role. She received the "Rising Star Award" at the 10th annual Essence Black Women In Hollywood event in February 2017.

In 2017, King was cast opposite Kevin Hart, Bryan Cranston, and Nicole Kidman in The Upside, a remake of the 2011 French film The Intouchables. Later that year, she was cast in the leading role of Somali activist Ifrah Ahmed in the biopic A Girl from Mogadishu.

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