While attending animation school, Hillenburg received a job on the children's television series Mother Goose and Grimm, and worked on the series from 1991 to 1993.
Sebagai animator, Hillenburg mendapat pekerjaan pada seri televisi anak anak Mother Goose and Grimm ketika mengikuti CalArts, dan bekerja pada seri itu dari 1991 sampai 1993.