The person who has directed the most episodes of Grey's Anatomy is Rob Corn. He directed over 40 episodes of Grey's Anatomy since its inception in 2005. Rob Corn is a producer and director known for his work in both television and film. He's known for bringing a nuanced, character-driven approach to his projects and Grey's Anatomy is no exception. However, the show's format—as with most TV series—allows for a number of directors to rotate throughout a season. Other notable directors for Grey's Anatomy include Debbie Allen, Chandra Wilson (who also plays Bailey on the show), and Kevin McKidd (who plays Owen Hunt), each of whom has directed multiple episodes. The number of directed episodes can always change as new episodes are produced. Therefore, for the most current and complete list of episode directors, you should consider checking the show's IMDb page. Remember that in many cases, the director of a TV show episode can have a significant impact on how the story is told and portrayed, so understanding who is behind the camera can add another layer to your enjoyment and understanding of the show.