Don Cassity is an illustrator who worked on the 1999 Bear in the Big Blue House book A Birthday Surprise!, drawing objects and locations (including the Otter Pond) for the photo characters.
Cassity has illustrated books featuring Rugrats, Despicable Me, and Aaaah! Real Monsters. He also drew covers for the 1996 Marvel Chillers paperback series. Cassity designed product packaging for various toys, including the Doctor Dreadful lab sets.