User blog comment:Bowl108/Resignation from Disney Prez might keep Phineas and Ferb here longer/@comment-406459-20110917030348/@comment-406459-20110923202423

Hillenburg's been working at least as long as Dan and Swampy have, since he and most of the Rocko staff went on to SpongeBob. Dan, Swampy, and Martin Olson are the Rocko vets who went to Phineas and Ferb.