<Table> <Tr> <Th_colspan="2"> Derek Shepherd </Th> </Tr> <Tr> <Td_colspan="2"> Grey's Anatomy character </Td> </Tr> <Tr> <Td_colspan="2"> Patrick Dempsey as Derek Shepherd in 2012 </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> "A Hard Day's Night" (1.01) March 27, 2005 </Td> </Tr> <Tr> <Th> Last appearance </Th> <Td> "You're My Home (Grey's Anatomy)" (11.25) May 14, 2015 </Td> </Tr> <Tr> <Th> Created by </Th> <Td> Shonda Rhimes </Td> </Tr> <Tr> <Th> Portrayed by </Th> <Td> Patrick Dempsey </Td> </Tr> <Tr> <Th_colspan="2"> Information </Th> </Tr> <Tr> <Th> Full name </Th> <Td> Derek Christopher Shepherd </Td> </Tr> <Tr> <Th> Nickname (s) </Th> <Td> McDreamy </Td> </Tr> <Tr> <Th> Occupation </Th> <Td> Attending neurosurgeon Member of the Board (former) Chief of Surgery (former) Head of Neurosurgery (former) </Td> </Tr> <Tr> <Th> Title </Th> <Td> M.D. F.A.C.S. </Td> </Tr> <Tr> <Th> Family </Th> <Td> Mr. Shepherd (father, deceased) Carolyn Maloney Shepherd (mother) Nancy Shepherd (sister) Kathleen "Kate" Shepherd (sister) Elizabeth "Lizzie" Shepherd (sister) Amelia Shepherd (sister) 9 unnamed nieces 6 unnamed nephews (one deceased) </Td> </Tr> <Tr> <Th> Spouse (s) </Th> <Td> Addison Montgomery (m . 1994; div. 2006) Meredith Grey (m . 2009--2015) </Td> </Tr> <Tr> <Th> Significant other (s) </Th> <Td> Rose </Td> </Tr> <Tr> <Th> Children </Th> <Td> Zola Shepherd (daughter) Derek Bailey Shepherd (son) Ellis Shepherd (daughter) (with Meredith) </Td> </Tr> <Tr> <Th> certifications </Th> <Td> M.D. F.A.C.S </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Derek Shepherd </Th> </Tr> <Tr> <Td_colspan="2"> Grey's Anatomy character </Td> </Tr> <Tr> <Td_colspan="2"> Patrick Dempsey as Derek Shepherd in 2012 </Td> </Tr>

When does derek shepherd become chief of surgery