Rodger Bumpass (born November 20, 1951) is an American actor and voice actor.
 He is best known for his long-running role as Squidward Tentacles on the American animated television series "SpongeBob SquarePants".
 He voices many other characters on the show, including Dr. Forrest and various anchovies.
 He also voiced The Chief in the animated series "Where on Earth Is Carmen Sandiego?
", and Mr. Besser, the school principal in the animated series "The Kids from Room 402".
 Bumpass has many other credits in animated films, animated television series, and video games.
Carl Harvey "C. H." Greenblatt (born June or October 17, 1972) is an American cartoon screenwriter, producer, and storyboard artist.
 He has worked on the hit TV series "SpongeBob SquarePants", and on the Cartoon Network's series "The Grim Adventures of Billy & Mandy" and "Evil Con Carne".
 He is best known as the creator of "Chowder" and "Harvey Beaks".
The Grim Adventures of Billy & Mandy (also known as Billy & Mandy) is an American animated television series created by Maxwell Atoms for Cartoon Network, and is the 14th of the network's Cartoon Cartoons (albeit on when it was part of "Grim & Evil", due to the "Cartoon Cartoons" brand being temporarily discontinued earlier in June 2003; the show itself is considered by some to still be a "Cartoon Cartoon" show regardless).
 It follows two children named Billy—a slow-witted boy—and Mandy—the cynical best friend—who, after winning a limbo game to save Billy's pet hamster, gain the mighty Grim Reaper as their best friend in eternal servitude and slavery.
Pinky and the Brain is an American animated television series.
 It was the first animated television series to be presented in Dolby Surround and the fourth collaboration of Steven Spielberg with his production company, Amblin Television, and produced by Warner Bros.
 Animation.
 The characters first appeared in 1993 as a recurring segment on "Animaniacs".
 It was later picked up as a series due to its popularity, with 65 episodes produced.
 Later, they appeared in the series, "Steven Spielberg Presents Pinky, Elmyra & the Brain".
Harvey Beaks is an American animated television series created by C.H. Greenblatt for Nickelodeon.
 The series premiered on March 28, 2015 following the 2015 Kids' Choice Awards.
"Harvey Beaks" is an American animated television series created by C. H. Greenblatt for Nickelodeon that first aired on March 28, 2015.
Jeff "Swampy" Marsh (born December 9, 1960) is an American animator, writer, director, producer, and voice actor associated with several animated television series, most notably as the co-creator, executive producer, and voice of Major Monogram of Disney's animated series "Phineas and Ferb".
 Marsh was born in Santa Monica, California, where he grew up with a heavily blended family dynamic.
 Marsh has been and continues to be a driving force behind several animation projects, working for over six seasons on the animated television series "The Simpsons".
 Marsh continued to work on other animated television series, including "King of the Hill" and "Rocko's Modern Life," before moving to England in 1996.
"Band Geeks" is the second part of the 15th episode of the second season, and the second half of the 35th episode overall, of the American animated television program "SpongeBob SquarePants".
 It originally aired on Nickelodeon in the United States on September 7, 2001.
 It was written by C. H. Greenblatt, Aaron Springer, and Merriwether Williams, and the animation was directed by Frank Weiss.
 Springer served as storyboard director, and Greenblatt served as storyboard artist.
 The song "Sweet Victory" by David Glen Eisley was featured in the episode and was later released on the album "" in 2005.
Chowder is an American animated television series created by C. H. Greenblatt for Cartoon Network.
 The series follows an aspiring young child named Chowder and his day-to-day adventures as an apprentice in Chef Mung Daal's catering company.
 Although he means well, Chowder often finds himself in predicaments due to his perpetual appetite and his nature as a scatterbrain.
 It is animated with both traditional animation as well as short stop motion and puppet sequences that are inter-cut into the episodes, and that run over the end credits.
 Stop motion sequences are produced by Screen Novelties.
 It is also the first Cartoon Network original series to premiere during Stuart Snyder's tenure as Jim Samples had resigned months before the series premiere.
The Itchy & Scratchy Show (often shortened as Itchy & Scratchy) is a running gag and fictional animated television series featured in the American animated television series "The Simpsons".
 It usually appears as a part of "The Krusty the Clown Show", watched regularly by Bart Simpson and Lisa Simpson.
 Itself an animated cartoon, "The Itchy & Scratchy Show" depicts a sadistic anthropomorphic blue mouse, Itchy (voiced by Dan Castellaneta), who repeatedly maims and kills an anthropomorphic, hapless threadbare black cat, Scratchy (voiced by Harry Shearer).
 The cartoon first appeared in "The Tracey Ullman Show" short "The Bart Simpson Show", which originally aired November 20, 1988.
 The cartoon's first appearance in "The Simpsons" was in the 1990 episode "There's No Disgrace Like Home".
 Typically presented as 15-to-60-second-long cartoons, the show is filled with gratuitous violence.
 "The Simpsons" also occasionally features characters who are involved with the production of "The Itchy & Scratchy Show", including Roger Meyers Jr. (voiced by Alex Rocco, and, later, Hank Azaria), who runs the studio and produces the show.

Question: Which American animated television series has C. H. Greenblatt worked on
Answer: The Grim Adventures of Billy