Credited with 19 episodes, Steve Callaghan is the most prolific writer on the "Family Guy" staff. Many of the writers that have left the show have gone on to create or produce other successful series. Neil Goldman and Garrett Donovan co-wrote 13 episodes for the NBC sitcom "Scrubs" during their eight-year run on the show, while also serving as co-producers and working their way up to executive producers. Mike Barker and Matt Weitzman left the show and went on to create the long-running and still ongoing adult animated series "American Dad!" MacFarlane is also a co-creator of "American Dad!" On November 4, 2013, it was announced that Barker had departed "American Dad!" during its run as well, after 10 seasons of serving as producer and co-showrunner over the series.