Title: Grey's Anatomy (season 7)
Content: Ellen Pompeo as Dr. Meredith Grey ; Sandra Oh as Dr. Cristina Yang ; Justin Chambers as Dr. Alex Karev ; Chandra Wilson as Dr. Miranda Bailey ; James Pickens, Jr. as Dr. Richard Webber ; Sara Ramirez as Dr. Callie Torres ; Eric Dane as Dr. Mark Sloan ; Chyler Leigh as Dr. Lexie Grey ; Kevin McKidd as Dr. Owen Hunt ; Jessica Capshaw as Dr. Arizona Robbins ; Kim Raver as Dr. Teddy Altman ; Sarah Drew as Dr. April Kepner ; Jesse Williams as Dr. Jackson Avery ; Patrick Dempsey as Dr. Derek Shepherd 
Title: Grey's Anatomy (season 7)
Content:  appears to be the top contender for Chief Resident. While Dr. Andrew Perkins presents Teddy with a very tempting proposition, Meredith and Derek make a life-changing decision. EpisodeNumber  = 147 ; EpisodeNumber2 = 21 ; Title          = I Will Survive ; DirectedBy     = Tom Verica ; WrittenBy      = Zoanne Clack ; Viewers= 9.63 ; ProdCode      = 721 ; OriginalAirDate = May 12, 2011 ; ShortSummary   = Personal and work pressures are adding up and have Meredith visibly on edge, Owen conducts formal interviews for the Chief Resident position, Cristina grows increasingly defiant, Alex and Lucy's undefined relationship gets tested, and Jackson 
Title: Grey's Anatomy (season 7)
Content: James Tupper as Dr. Andrew Perkins ; Rachael Taylor as Dr. Lucy Fields ; Peter MacNicol as Dr. Robert Stark ; Scott Foley as Henry Burton ; Daniel Sunjata as Nurse Eli ; Loretta Devine as Adele Webber ; Jeff Perry as Thatcher Grey ; Nicole Cummins as Paramedic Nicole 
Title: Grey's Anatomy (season 7)
Content:  The seventh season of the American television medical drama Grey's Anatomy, began airing on September 23, 2010 on the American Broadcasting Company (ABC), and concluded on May 19, 2011 ending the season with a total of 22 episodes. The season was produced by ABC Studios, in association with Shondaland Production Company and The Mark Gordon Company; the showrunner being Shonda Rhimes and head writer Krista Vernoff. The season follows the aftermath of the season 6 shooting, in which Derek Shepherd (Patrick Dempsey), Alex Karev (Justin Chambers) Reed, and Charles are shot, and a total of 11 people died. Cristina Yang (Sandra Oh) was the most affected by the shooting, quitting her 
Title: Grey's Anatomy (season 7)
Content:  Zola. Lexie Grey (Chyler Leigh) decides to give Mark a second chance but later starts a relationship with Jackson Avery (Jesse Williams). Teddy Altman (Kim Raver) starts a relationship with Andrew Perkins (James Tupper), a trauma counselor, but later falls for her patient, Henry Burton. The season ended with an average of 11.41 million viewers and was ranked #31 in overall viewership and was #9 in the 18-49 key demographic. Loretta Devine won the Outstanding Guest Actress in a Drama at the 63rd Primetime Emmy Awards. The season also garnered 7 nominations at the 37th People's Choice Awards and also won the Outstanding Drama Series at the NAACP Image Awards.
Title: Grey's Anatomy
Content:  senior resident, who works with attending physicians Derek Shepherd (Patrick Dempsey), head of neurosurgery and Meredith's love-interest, and Preston Burke (Isaiah Washington), head of cardiothoracic surgery, who becomes Yang's fiancé. Richard Webber (James Pickens Jr.), Chief of Surgery and attending general surgeon, is the former lover of Ellis Grey. During the first 6 seasons, Burke, O'Malley, and Stevens all depart the series. The series also shows drama and emotions focused on Meredith's life. In addition to Webber, Burke, and Shepherd, the surgical wing is primarily supervised by Addison Montgomery (Kate Walsh), Shepherd's ex-wife and the head of OB/GYN, neonatal and fetal surgery who 
Title: Grey's Anatomy (season 7)
Content:  grandiose endeavor that is sure to get him the Chief Resident spot. Teddy is pleasantly surprised by the return of a familiar face. ; LineColor      = 800020 EpisodeNumber  = 146 ; EpisodeNumber2 = 20 ; Title          = White Wedding ; DirectedBy     = Chandra Wilson ; WrittenBy      = Stacy McKee ; Viewers= 10.11 ; ProdCode      = 720 ; OriginalAirDate = May 5, 2011 ; ShortSummary   = As Callie and Arizona's wedding approaches, the couple quickly realize that the day they've been looking forward to is not turning out the way they'd envisioned. Meanwhile, Alex continues to make the other residents jealous as 
Title: Grey's Anatomy (season 7)
Content:  out when Henry has another health complication -- leaving them both a little exposed. The competitiveness among the residents for the Chief Resident position is amplified when Richard receives the green light for his diabetes clinical trial. ; LineColor      = 800020 EpisodeNumber  = 144 ; EpisodeNumber2 = 18 ; Title          = Song Beneath the Song ; DirectedBy     = Tony Phelan ; WrittenBy      = Shonda Rhimes ; Viewers= 13.09 ; ProdCode      = 718 ; OriginalAirDate = March 31, 2011 ; ShortSummary   = In a series first, the music that has been at the heart of the show and been beloved by fans 
Title: Grey's Anatomy
Content:  The five characters who are first introduced in the series premiere, as surgical interns, are Grey, Yang, Stevens, Karev, and O'Malley. They are initially mentored by Bailey, a senior resident who becomes the hospital's Chief Resident, and later an attending general surgeon, in season 6. The surgical program is initially headed by Richard Webber, the Chief of Surgery, who has a pre-existing personal relationship with Meredith, having had an affair with her mother when Meredith was a child. In Webber's employ are attending neurosurgeon Derek Shepherd, dubbed 'McDreamy' by the residents, and attending cardiothoracic surgeon Preston Burke. Shepherd is introduced as Meredith's love-interest, while Burke begins a relationship with 
Title: Grey's Anatomy (season 7)
Content: Kate Walsh as Dr. Addison Montgomery ; Caterina Scorsone as Dr. Amelia Shepherd ; Jason George as Dr. Ben Warren ; Mark Saul as Steve Mastow ; Mandy Moore as Mary Portman ; Ryan Devlin as Bill Portman ; Frances Conroy as Eleanor ; Diane Farr as Laila ; Héctor Elizondo as Carlos Torres ; Debra Mooney as Evelyn Hunt ; Amanda Foreman as Nora ; Amber Benson as Corrine Henley ; Jamie Chung as Trina ; Steven W. Bailey as Joe, the Bartender ; Adam Busch as an Fred Wilson ; Marina Sirtis as Sonya ; Nancy Travis as Allison Baker ; L. Scott Caldwell as Alison ; Wilmer Calderon as Raul Aranda ; Toni Torres as Annette Aranda ; Anthony Keyvan as Miguel Aranda ; Amber Stevens as Laurel Pinson ; Candice Patton as Meg Waylon ; Doris Roberts as Gladys 

Question: who becomes chief resident on grey's anatomy season 7?
Answer: April Kepner M.D.
Kepner.