Question: Who was the show runner for the season in which "Treehouse of Horror XIII" aired?

 It first aired on the Fox network in the United States on November 3, 2002, three days after Halloween. "Treehouse of Horror XIII" is the first episode of "The Simpsons"<nowiki>'</nowiki> fourteenth season and the thirteenth Halloween episode.  It is the second Treehouse of Horror to have a zombie related segment, and the last Treehouse of Horror to have three separate writers credited for writing three stories (starting with "Treehouse of Horror XIV", only one writer is credited for writing the three stories). <SEP> "The Simpsons"' thirteenth season originally aired on the Fox network between November 6, 2001 and May 22, 2002 and consists of 22 episodes.  The show runner for the thirteenth production season was Al Jean who executive-produced 17 episodes.  Mike Scully executive-produced the remaining five, which were all hold-overs that were produced for the previous season. " The Simpsons" is an animated series about a working-class family, which consists of Homer, Marge, Bart, Lisa, and Maggie.  The show is set in the fictional city of Springfield, and lampoons American culture, society, television and many aspects of the human condition. <SEP> This is a list of "Treehouse of Horror" episodes produced by the animated television series "The Simpsons".  "Treehouse of Horror" episodes have aired annually since the second season (1990) and each episode has three separate segments.  These segments usually involve the family in some horror, science fiction, or supernatural setting and always take place outside the normal continuity of the show and are therefore considered to be non-canon. " Treehouse of Horror" episode aired on October 25, 1990 and was inspired by EC Comics Horror tales.  Before "Treehouse of Horror XI", which aired in 2000, every episode has aired in the week preceding or on October 31; "Treehouse of Horror II" and "Treehouse of Horror X" are the only episodes to air on Halloween.  Between 2000 and 2011, due to Fox's contract with Major League Baseball's World Series, several episodes have originally aired in November; as of 2011 every "Treehouse of Horror" episode has aired during the month of October.  From "Treehouse of Horror" to "Treehouse of Horror XIII", all three segments were written by different writers and in some cases there was a fourth writer that wrote the opening and wraparound segments.  For "Treehouse of Horror", there were even three different directors for the episode.  Starting with season fifteen's "Treehouse of Horror XIV", only one writer was credited as having written a "Treehouse of Horror" episode, and the trend has continued since. <SEP> "The Simpsons"' fourteenth season was originally broadcast on the Fox network in the United States between November 3, 2002 and May 18, 2003.  The other episode, "How I Spent My Strummer Vacation", was run by Mike Scully.  The season contains five hold-overs from the previous season's production run.  The fourteenth season has met with mostly positive reviews and won two Primetime Emmy Awards, including Outstanding Animated Program (For Programming less than One Hour), four Annie Awards and a Writers Guild of America Award.  On December 6, 2011, it was released on DVD and Blu-ray in North America.  This season contains the show's 300th episode, "The Strong Arms of The Ma".  The show runner for the fourteenth production season was Al Jean, who executive produced 21 of 22 episodes.