Simpson also helped develop the animated television series Johnny Test in 2004, producing the pilot that preceded the first season order.

Aaron has been producing animation since 2001, starting with Jorge Gutierrez's El Macho, an online series of shorts for Sony Pictures Digital.

Starting in 2006, Simpson served as Vice President, Animation Production and Development at JibJab, where he supervised Internet and mobile ventures.

[3] In 2012, Simpson directed Steve Jobs: Resurrection, an animated parody that coincided with the release of the iPhone 5.

[6] In 2006, Simpson was nominated as a Producer for Outstanding Special Class Animated Program at the 33rd Daytime Emmy Awards.