Question: What position did Mike Scully and Al Jean both hold at varying times in the Simpsons?

Context paragraphs:
The Simpsons (season 9): "The Simpsons"' ninth season originally aired on the Fox network between September 1997 and May 1998, beginning on Sunday, September 21, 1997, with "The City of New York vs. Homer Simpson".  The showrunner for the ninth production season was Mike Scully.  The aired season contained three episodes which were hold-over episodes from season eight, which Bill Oakley and Josh Weinstein ran.  It also contained two episodes which were run by David Mirkin, and another two hold-over episodes which were run by Al Jean and Mike Reiss.

Market in Honey Lane: Market in Honey Lane was an ATV British television weekly series, which switched to a twice weekly soap opera format (shown at varying times around the ITV regions) after the first year.  It was broadcast between April 1967 and March 1969.  For the final two years, the name was shortened to just Honey Lane

The Springfield Files: "The Springfield Files" is the tenth episode of "The Simpsons"<nowiki>'</nowiki> eighth season.  It originally aired on the Fox network in the United States on January 12, 1997.  In the episode, Homer believes he has discovered an alien in Springfield.  It was written by Reid Harrison and directed by Steven Dean Moore.  Leonard Nimoy guest stars as himself and David Duchovny and Gillian Anderson guest star as agents Fox Mulder and Dana Scully, their characters on "The X-Files".  The episode serves as a crossover with "The X-Files" and features numerous references to the series.  The story came from former showrunners Al Jean and Mike Reiss, who returned to produce this episode while under contract with Disney.  It received mostly positive reviews from critics; Jean and Reiss won an Annie Award for producing it.

Bill Murray (CIA officer): William D. (Bill) Murray retired from the Central Intelligence Agency (CIA) in March 2005, after a career of 40 years of military and civilian government service.  During his 36 years with CIA, Murray rose from entry level to the highest levels of the Senior Executive Service and managed field operations in a number of overseas locations, frequently in times of war and civil strife.  He also managed several different Washington based units at varying times and at increasing levels of complexity.  The main thrust of his career was in the Middle East but he also served as the organization’s field manager for operations in the Balkans and later as the senior officer commanding one of the largest and most important offices in Paris.

Simpsoncalifragilisticexpiala(Annoyed Grunt)cious: "Simpsoncalifragilisticexpiala(Annoyed Grunt)cious" is the thirteenth episode of "The Simpsons"<nowiki>'</nowiki> eighth season.  It originally aired on the Fox network in the United States on February 7, 1997.  When Marge becomes stressed, the Simpsons hire a nanny, a Mary Poppins parody, Shary Bobbins (voiced by Maggie Roswell).  The episode was directed by Chuck Sheetz and written and executive produced by Al Jean and Mike Reiss.  It was the last episode for which Reiss received a writing credit.  In 2014, Jean selected it as one of five essential episodes in the show's history.

Mike Scully: Michael "Mike" Scully (born October 2, 1956) is an American television writer and producer.  He is known for his work as executive producer and showrunner of the animated sitcom "The Simpsons" from 1997 to 2001.  Scully grew up in West Springfield, Massachusetts and long had an interest in writing.  He was an underachiever at school and dropped out of college, going on to work in a series of jobs.  Eventually, in 1986, he moved to Los Angeles where he worked as a stand-up comic and wrote for Yakov Smirnoff.

Julie Thacker: Julie Thacker is an American television writer.  She has written for "The Simpsons", and along with her husband "The Simpsons" writer and producer Mike Scully she has co-created "The Pitts" and "Complete Savages".

The Simpsons (season 13): "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.

The Simpsons (season 5): "The Simpsons"' fifth season originally aired on the Fox network between September 30, 1993 and May 19, 1994.  The showrunner for the fifth production season was David Mirkin who executive produced 20 episodes.  Al Jean and Mike Reiss executive produced the remaining two, which were both hold overs that were produced for the previous season.  The season contains some of the series' most acclaimed episodes, including "Cape Feare" and "Rosebud".  It also includes the 100th episode, "Sweet Seymour Skinner's Baadasssss Song".  The season was nominated for two Primetime Emmy Awards and won an Annie Award for Best Animated Television Program as well as an Environmental Media Award and a Genesis Award.  The DVD box set was released in Region 1 on December 21, 2004, Region 2 on March 21, 2005, and Region 4 on March 23, 2005.

The Simpsons (season 14): "The Simpsons"' fourteenth season was originally broadcast on the Fox network in the United States between November 3, 2002 and May 18, 2003.  The show runner for the fourteenth production season was Al Jean, who executive produced 21 of 22 episodes.  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".

Supporting paragraphs: The Simpsons (season 14) Mike Scully
Answer: showrunner