 Credited with 18 episodes , Steve Callaghan is the most prolific writer on 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 . 
