<Tr> <Td> Meredith Grey </Td> <Td> Ellen Pompeo </Td> <Td> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 </Td> <Td> N / A </Td> <Td> Chief of General Surgery, Attending General Surgeon, Director of the Board, Grey Sloan Shareholder </Td> <Td> M.D., FACS </Td> </Tr> <Tr> <Td_colspan="7"> Meredith Grey is the central protagonist of the show and narrator of the majority of episodes . She begins the series as an intern and has since progressed along her medical career path . She went to the Geisel School of Medicine at Dartmouth College after sleeping around Europe with her former best friend, Sadie . Her character is defined by her romantic relationships, as well as the lingering effects her mother's affair with Richard Webber has had on her life . She is best friends with Cristina Yang . Following a long romance, she marries neurosurgeon, Derek Shepherd . The day of the shooting in Season 6, she discovers that she is pregnant, but that same day, she miscarriages due to stress . She later learns that she has a "hostile uterus" and starts taking fertility shots . When they are unsuccessful, Meredith and Derek adopt Zola, a surgical African orphan . In Season 9, following the plane crash that killed her younger sister, Lexie Grey, Meredith becomes an attending general surgeon and has earned the nickname of "Medusa" by her interns and residents . Her son, Bailey, is born in the Season 9 finale; she gives birth to him by C - section and has a major abdominal surgery afterwards following a fall . In the Season 10 finale, she says goodbye to Cristina as Cristina leaves to go to Zurich to take Burke's hospital; before they say goodbye, Cristina reminds Meredith that she should not let Derek's career hinder her own . In Season 11, Meredith not only struggles with keeping her marriage afloat after Derek decides to work for the president in DC, but also with learning that she has another half - sister, Maggie Pierce . After Derek is killed at the end of Season 11, Meredith escapes to California for a year, where she gives birth to their daughter, whom she names Ellis after her late mother . In Season 12, Meredith returns to Seattle and is named Chief of General Surgery by the newly appointed Chief of Surgery, Miranda Bailey . Meredith tries moving on by dating William Thorpe, a surgeon from another hospital, but has trouble forgetting about Derek . She is finally able to take the next step with Nathan Riggs, and the two begin a relationship after months of Nathan pursuing Meredith, but the romance comes to an end after Nathan's missing fiancée, Megan, is found . Meredith wins a Harper Avery Award in Season 14 after performing a ground - breaking abdominal wall transplant on Megan . </Td> </Tr> <Tr> <Td> Erica Hahn </Td> <Td> Brooke Smith </Td> <Td> 4, 5 </Td> <Td> 2, 3 </Td> <Td> Chief of Cardiothoracic surgery, Attending Cardiothoracic Surgeon </Td> <Td> M.D., FACS </Td> </Tr> <Tr> <Td_colspan="7"> Following Preston Burke's departure, Erica Hahn takes his position as Chief of Cardiothoracic Surgery at Seattle Grace . Her brusque, somewhat harsh personality is tempered by Callie Torres, with whom she begins a relationship . Her time at Seattle Grace ends abruptly, however, when she becomes discontent with Izzie Stevens, and the lack of disciplinary action following the Denny Duquette incident . Dr. Hahn attended the Johns Hopkins School of Medicine, where she was in the same class as Dr. Burke . </Td> </Tr>

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