He wrote on SpongeBob for a decade and had written on almost 100 episodes. During his time while he was still writing, Casey and Zeus were among the most loyal writers of the crew, being the only writers besides Luke Brookshier and Marc Ceccarelli to write for season 9 after the departure of Aaron Springer in the previous season.
In 2012, he stated on Twitter that he no longer wrote anymore SpongeBob episodes because he wanted to work for Uncle Grandpa, so Kaz now takes over for him after he returned to the show after a long-gone hiatus. He was the supervising director and creative director in Uncle Grandpa until the show ended in summer 2017. Since then he has been working on Unikitty!. He has also worked on Victor and Valentino as a supervising producer since 2019, which Zeus Cervas has been a writer on.
Casey has stated that his favorite episode from SpongeBob he worked on is "Bummer Vacation."