The TV series Grey's Anatomy was created and chiefly written by Shonda Rhimes. She served as the showrunner, head writer, and executive producer from its debut in 2005 up until 2015. Shonda Rhimes is well-known for creating diverse casts and strong female characters in her works, with Grey's Anatomy being one of her most prominent projects.
Other writers contributed to various episodes and seasons, but Shonda Rhimes is the original creator and primary driving creative force behind the show.