writer (85 episodes, 2004-2010)
creator (14 episodes, 2008-2010)
written by (3 episodes, 2009-2016)
created by (2 episodes, 2009-2016)
created by/written by (1 episode, 2016)
head writer (71 episodes, 2004-2008)
writer (52 episodes, 2006-2017)
writer (51 episodes, 2006-2017)
written by (4 episodes, 2009-2016)
writer (31 episodes, 2007-2010)
written by (1 episode, 2009)
writer (16 episodes, 2008-2017)
created by (4 episodes, 2009-2016)
writer (3 episodes, 2010-2017)
written by (2 episodes, 2013-2016)
(unknown episodes)