Maggie Pierce

Margaret Pierce, M.D., F.A.C.S. is a fictional character from the American television medical drama Grey's Anatomy, which airs on the American Broadcasting Company (ABC) in the United States. The character was created by series producer Shonda Rhimes and is portrayed by actress Kelly McCreary from the tenth season's penultimate episode onwards. It is revealed in the season ten finale, Maggie's biological parents are Richard Webber (James Pickens Jr.) and Ellis Grey (Kate Burton), making her Meredith's half-sister. McCreary was upgraded to a series regular in the eleventh episode of the eleventh season. Pierce has been described as "perky" and "chatty", as well as focusing mostly on her academic career rather than social life. She graduated from medical school at 19 and became the head of her department at the young age of 27 years old. Storylines Maggie is introduced in the 23rd episode of the tenth season. Cristina Yang interviews various different candidates to replace the head of her department in Cardiothoracic surgery. Maggie, having finished high school and medical school early at 19, becomes head of her department at 27 years old. It is revealed in the season 10 finale "Fear (of the Unknown)" that Maggie's biological mother was Ellis Grey. Richard Webber is shocked by this, knowing he is her biological father. Throughout the eleventh season, Webber struggles to deal with the revelation and keeps it from Maggie. Maggie explains that 2 years prior, she looked for her birth mom and needed to go to the court for the records. She found out that she was dead, but got her name, and discovered that she was an amazing surgeon that worked at the Seattle Grace Hospital. She stated that that's not why she took the job, but it's "a little bit" why she took the interview.