structural:expansion
Executive producers and showrunners

List of showrunners throughout the series' run:

Matt Groening and James L. Brooks have served as executive producers during the show's entire history, and also function as creative consultants. Sam Simon, described by former Simpsons director Brad Bird as "the unsung hero" of the show, served as creative supervisor for the first four seasons. He was constantly at odds with Groening, Brooks and the show's production company Gracie Films and left in 1993. Before leaving, he negotiated a deal that sees him receive a share of the profits every year, and an executive producer credit despite not having worked on the show since 1993, at least until his passing in 2015. A more involved position on the show is the showrunner, who acts as head writer and manages the show's production for an entire season.