Seth MacFarlane has gone on to become one of the most successful producers of primetime animation.
It's easy to forget that Seth's career in animation had humble beginnings. After graduating from the Rhode Island School of Design, MacFarlane went right to work, writing for the Nickelodeon TV series Hey Arnold!.
Of course, MacFarlane and Craig Bartlett, the show's creator, didn't exactly see eye to eye. Despite the back and forth arguing behind the scenes, I'm sure you have a favorite Hey Arnold! episode which happened to have been written by MacFarlane.
MacFarlane spent 1996 thru 98 on the Hey Arnold! writing staff before moving on to his greater success at Fox, where he would create Family Guy.
To this day, many Hey Arnold! fans continue to ponder how the show would've turned out had it not been for MacFarlane's writing.