Question: When did the short series, in which Tom Herpich is best known for, become commissioned into a full-length series?

full_context: Document 1: Hitman (Adventure Time): "Hitman" is the name for the fourth episode of the third season of the American animated television series "Adventure Time". The episode was written and storyboarded by Jesse Moynihan and Bert Youn, from a story by Mark Banker, Kent Osborne, Patrick McHale, and series creator Pendleton Ward. It originally aired on Cartoon Network on August 1, 2011.
Document 2: Adventure Time (pilot): "Adventure Time" is an animated short created by Pendleton Ward, as well as the pilot to the Cartoon Network series of the same name. The short follows the adventures of Pen (voiced by Zack Shada), a human boy, and his best friend Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will. In this episode, Pen and Jake have to rescue Princess Bubblegum (voiced by Paige Moss) from the antagonistic Ice King (voiced by John Kassir).
Document 3: List of Adventure Time episodes: "Adventure Time" is an American animated television series created by Pendleton Ward for Cartoon Network. The series follows the adventures of Finn (voiced by Jeremy Shada), a human boy, and his best friend and adoptive brother Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will. Finn and Jake live in the post-apocalyptic Land of Ooo. Throughout the series, they interact with the show's other main characters: Princess Bubblegum (voiced by Hynden Walch), the sovereign of the Candy Kingdom; the Ice King (voiced by Tom Kenny), a demented but largely misunderstood ice wizard; Marceline the Vampire Queen (voiced by Olivia Olson), a thousand-year-old vampire and rock music enthusiast; Lumpy Space Princess (voiced by Ward), a melodramatic and immature princess made out of "irradiated stardust"; BMO (voiced by Niki Yang), a sentient video game console-shaped robot that lives with Finn and Jake; and Flame Princess (voiced by Jessica DiCicco), a flame elemental and ruler of the Fire Kingdom. The pilot first aired in 2007, and it was later re-aired on the incubator series "Random! Cartoons" on Nicktoons Network. The pilot eventually leaked onto the internet and became a cult hit on YouTube. After Nickelodeon declined to turn the short into a full-fledged show, Cartoon Network purchased the rights, and "Adventure Time" launched as a series on April 5, 2010.
Document 4: Adventure Time (season 4): The fourth season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on April 2, 2012 and concluded on October 22, 2012. The season was produced by Cartoon Network Studios and Frederator Studios. The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess.
Document 5: Adventure Time (season 1): The first season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on April 5, 2010 and concluded on September 27, 2010. The season was produced by Cartoon Network Studios and Frederator Studios. The series is based on a short produced for Frederator's Nicktoons Network animation incubator series "Random! Cartoons". The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, and BMO.
Document 6: Adventure Time (season 7): The seventh season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on November 2, 2015 and concluded on March 19, 2016. The season was produced by Cartoon Network Studios and Frederator Studios. The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess.
Document 7: James Baxter the Horse: "James Baxter the Horse" is the nineteenth episode of the fifth season of the American animated television series "Adventure Time". The episode was written and storyboarded by series creator Pendleton Ward and Somvilay Xayaphone, from a story by Patrick McHale, Kent Osborne, and Ward. It originally aired on Cartoon Network on May 6, 2013. The episode guest stars animator James Baxter as the titular horse.
Document 8: Adventure Time (season 2): The second season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on October 11, 2010 and concluded on May 2, 2011. The season was produced by Cartoon Network Studios and Frederator Studios. The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, and BMO.
Document 9: Thurop Van Orman: Mark "Thurop" Van Orman (born October 26, 1976 in Norfolk, Virginia, US) is an American TV writer, director, cartoonist, producer, animator, storyboard artist, storyboard director, singer and voice actor. He is known for being the creator of the animated series "The Marvelous Misadventures of Flapjack", in which he voices the title character. He studied character animation at the California Institute of the Arts. He was the storyboard artist for "Camp Lazlo", "The Powerpuff Girls" and "The Grim Adventures of Billy & Mandy". He was also the co-writer for these shows. He was also the supervising producer for "Adventure Time", and served as one for "Sanjay and Craig" in its 1st season only. Thurop is also somewhat known for responding to much of his fans' fanart through the website DeviantArt. He is currently working on his stop motion film project titled "Black Forest", as well as providing concept art for the film adaptation of "The Little Prince". He has also announced via Twitter that he will be writing a film about Vikings.
Document 10: In Your Footsteps: "In Your Footsteps" is the seventh episode of the fourth season of the American animated television series "Adventure Time". The episode was written and storyboarded by Tom Herpich and Skyler Page, from a story by Patrick McHale, Kent Osborne, and Pendleton Ward. It originally aired on Cartoon Network on April 30, 2012. The episode guest stars Eric Bauza as a bear and features Ward voicing the Lich-possessed snail.
Document 11: Adventure Time: Adventure Time is an American animated television series created by Pendleton Ward for Cartoon Network. It follows the adventures of a boy named Finn (voiced by Jeremy Shada) and his best friend and adoptive brother Jake (John DiMaggio)— a dog with the magical power to change shape and size at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with Princess Bubblegum (Hynden Walch), the Ice King (Tom Kenny), Marceline the Vampire Queen (Olivia Olson), BMO (Niki Yang), and others. The series is based on a 2007 short produced for Nicktoons and Frederator Studios' animation incubator series "Random! Cartoons". After the short became a viral hit on the Internet, Cartoon Network commissioned a full-length series, which previewed on March 11, 2010, and officially premiered on April 5, 2010.
Document 12: Tom Herpich: Thomas Herpich (born October 1979) is an American artist who is best known for being a writer and storyboard artist on the animated television series "Adventure Time".
Document 13: Tom Warburton: Thomas Warburton (born August 31, 1968), often credited as Mr. Warburton, is an American animator, producer, writer and designer. He is best known for creating the animated television series "". He also created the animated short "Kenny and the Chimp". Prior to that he served as production designer on the first season of "Beavis and Butt-Head" and was the lead character designer for the animated series "Pepper Ann". He is also the author of the book "A Thousand Times No". Since moving to Los Angeles in 2009 he has worked at Disney Television Animation serving as creative director on "Fish Hooks" and co-executive producer on "The 7D".
Document 14: Five Short Graybles: "Five Short Graybles" is the second episode of the fourth season of the American animated television series "Adventure Time". The episode was written and storyboarded by Tom Herpich, Skyler Page, and Cole Sanchez, from a story by Patrick McHale, Kent Osborne, and Pendleton Ward. It originally aired on Cartoon Network on April 9, 2012. The episode guest stars Emo Philips as Cuber.
Document 15: Adventure Time (season 6): The sixth season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on April 21, 2014 and concluded on June 5, 2015. The season was produced by Cartoon Network Studios and Frederator Studios. The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, BMO, and Flame Princess.
ground_truth: March 11, 2010