The regular directors were Rob Corn and Jessica Yu.Producer Shonda Rhimes wrote five of the seventeen episodes, two of which were along with fellow producer Krista Vernoff.Despite garnering several awards and nominations for the cast members and the production team, the season received a mixed response from critics and fans.

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It was also produced by Shonda Land Production Company, and The Mark Gordon Company, whereas Buena Vista International, Inc. The executive producers were creator and show runner Shonda Rhimes, Betsy Beers, Mark Gordon, Krista Vernoff, Rob Corn, Mark Wilding, Joan Rater, and James D.

Parriott, all part of the production team since the series' inception.

The season was officially released on DVD as a five-disc boxset under the title of Grey's Anatomy: Season Four – Expanded on September 9, 2008 by Buena Vista Home Entertainment.

For the first time in the show's history, many cast changes occur, seeing the first departure of two main cast members.

Miranda Bailey, former mentor of the five residents during their internship. portrayed attending physician and general surgeon Dr.

Richard Webber, who continues his position as Chief of Surgery, despite his former wishes of retirement. Calliope "Callie" Torres, who was portrayed by Sara Ramirez, has to face her husband's unfaithfulness and her unexpected bisexuality. Mark Sloan was portrayed by Eric Dane, who is constantly seeking reconciliation with former best friend, attending physician and Chief of Neurosurgery Dr.

In addition to the regular seventeen episodes, a clip-show narrated by the editors of People recapped previous events of the show and made the transition from Grey's Anatomy to Private Practice, a spin-off focusing of Dr.

Addison Montgomery and aired on September 19, 2007, before the season premiere.

Upon her return, she makes Sandra Oh's character, Cristina Yang work harder for her success in Cardiothoracics and initially served as a new love interest for Eric Dane's Mark Sloan.

Even though a new male character was originally thought to be introduced as a rival for Dr. The fourth season had twelve roles receiving star billing, with ten of them returning from the previous season, eight of whom are part of the original cast from the first one.

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