First of all, he created one of the most funny, creative video games of all time:
I mean, even if he did nothing else in his life,
he created Professor Monkey For A Head:
That alone would have been enough for him to be ensconced in the Mr. Warburton pantheon of awesomeness for all eternity.
But no... Mr. TenNapel moved on from there.
He made a show on Nickelodeon called Catscratch:
And he rocked some awesome graphic novels:
What else has he done, you ask?
Well, as of Comic Con 2010, he's drawn in my sketchbook: