Sandra Miju Oh is a Canadian and American actress. She is known for her starring roles as Rita Wu in the HBO comedy series Arliss (1996–2002), Dr. Cristina Yang in the ABC medical drama series Grey's Anatomy (2005–2014), and Eve Polastri in the BBC America spy thriller series Killing Eve (2018–2022). She has received two Golden Globe Awards and four Screen Actors Guild Awards. In 2019, Time magazine named Oh one of the 100 most influential people in the world.
Sandra Miju Oh was born in Nepean, Ontario, on July 20, 1971, the daughter of middle-class South Korean immigrants Oh Young-nam, a biochemist, and Oh Jun-su (John), a businessperson. Her parents had moved to the area in the early 1960s. She has a brother, Ray, and a sister, Grace, and grew up in a Christian household, living on Camwood Crescent in Nepean, where she began acting and practicing ballet at age four to correct her pigeon-toed stance. Growing up, Oh was one of the few youths of Asian descent in Nepean.
At age ten, Oh played The Wizard of Woe in a class musical called The Canada Goose. Later, at Sir Robert Borden High School, she founded the environmental club BASE (Borden Active Students for the Environment), leading a campaign against the use of styrofoam cups. While in high school, she was elected student council president. She also played the flute and continued both her ballet training and acting studies, though she knew that she "was not good enough to be a professional dancer" and eventually focused on acting. She took drama classes, acted in school plays, and joined the drama club, where she took part in the Canadian Improv Games and Skit Row High, a comedy group. Against her parents' advice, she rejected a four-year journalism scholarship to Carleton University to study drama at the National Theatre School of Canada in Montreal, paying her own way.
Oh told her parents that she would try acting for a few years, and promised to return to university if it failed. Reflecting on foregoing university, she has said that she is "the only person in [her] family who doesn't have a master's in something". Soon after graduating from the National Theatre School in 1993, she starred in a stage production of David Mamet's Oleanna in London, Ontario. Around the same time, she won roles in biographical television films of two significant female Chinese-Canadians: as Vancouver author Evelyn Lau in The Diary of Evelyn Lau, where she won the role over more than 1,000 others who auditioned, and as Adrienne Clarkson in a CBC biopic of Clarkson's life.