Private Practice is a medical drama television program which premiered on September 26, 2007 on ABC. A spin-off of Grey's Anatomy, the series chronicles the life of Dr. Addison Montgomery, played by Kate Walsh, as she leaves Seattle Grace Hospital in order to join a private practice in Los Angeles. The series was created by Shonda Rhimes, who also serves as executive producer alongside Betsy Beers, Mark Gordon, Mark Tinker and Jon Cowan & Robert Rovner, who serve as showrunners due to Rhimes's duties on Grey's Anatomy