What position did Mike Scully and Al Jean both hold at varying times in the Simpsons?
The Simpsons (season 14):  The show runner for the fourteenth production season was Al Jean, who executive produced 21 of 22 episodes. Mike Scully:  He is known for his work as executive producer and showrunner of the animated sitcom "The Simpsons" from 1997 to 2001.
showrunner