position from the first 2 seasons as one of the most prominent members of the writing staff. Betsy Beers, Mark Gordon, Mark Wilding, and Rob Corn returned as executive producers, along with James D. Parriott, Peter Horton, and Krista Vernoff, who have been in this position since the inception of the series. Parriott, who also served as an episodic writer, left the series at the conclusion of the season. Joan Rater and Tony Phelan continued to serve as co-executive producers, with Rater being a supervising producer as well. Stacy McKee, who would be promoted to co-executive producer for the third season, returned to the series as a producer and a member of the writing staff. Having written 3 episodes for the first season, Rhimes returned as a writer for 5 episodes. Parriott, Vernoff, Phelan, Rater, Wilding and Mimi Schmir were the most prominent members of the writing staff, with Parriott, Phelan, Rater, Wilding, Clack writing 2 episodes and Schmir producing the script for 3. Gabrielle Stanton and Harry Werksman, Jr. worked together for the writing of 2 episodes, after having written 1 episode for the series in the past. The season includes the first episode to be written by Zoanne Clack, who would become one of the series' main writers, as well as a co-producer and executive story editor. Other writers include Kip Koenig, Blythe Robe and Elizabeth Klaviter. Executive producer Peter Horton returned to the series to direct 5 episodes for the season, after writing 2 episodes in the second season. Rob Corn directed 2 episodes, whereas Adam Davidson is credited for writing 3 episodes, his last ones in the series. Among the other directors are Wendey Stanzler, Mark Tinker, Jeff Melman, Jessica Yu, Lesli Linka Glatter, Michael Dinner, Dan Minahan, David Paymer, Julie Anne Robinson, Tricia Brock, and Seith Mann. Danny Lux continued his position as the main music composer for the series, while Herbert Davis, Tim Suhrstedt and Adam Kane served as the season's cinematography directors. Susan Vaill and Edward Ornelas resumed their positions as editors, joined by Briana London, who left the series after 9 episodes. Linda Lowy and John Brace, responsible for the casting since the beginning of the series, returned as casting team members. After the departure of Laurence Bennett, the production design team was taken over by Donald Lee Harris, with Amy B. Ancona and Brandee Dell'Aringa joining for 10 episodes each. The