Simons also co-created and wrote the Robotech: Clone comic series.
In addition to his graphic novel and novel work, Simons also paints backgrounds for animation, including Invader Zim and Jackie Chan Adventures. He painted both issues of Jhonen Vasquez’s comic, I Feel Sick.
Simons works with his wife, illustrator Tavisha Wolfgarth. The two currently produce a biweekly webcomic "@Tavicat".
In 2007, he was a frequent guest panelist on the video game and geek culture podcast The Weekly Geek.
- Invader Zim (voice) (TV) (GIR)
- Invader Zim (2001-2002-2006)
- ShutterBox (write, co-artist) (2003)