In 2011, he created the NBC fantasy police procedural drama television series Grimm, which premiered in the 2011 fall season.[1][4] It aired to March 31, 2017, for 123 episodes, running for over six seasons. Grimm was originally developed for CBS, but did not end up moving forward due to the 2007–08 writers' strike. In January 2011, the series moved to NBC. It has been described as "a cop drama—with a twist ... a dark and fantastical project about a world in which characters inspired by Grimms' Fairy Tales exist",[5] though the stories and characters inspiring the show are also drawn from other sources.
Carpenter's first novel, Killer, published in 2010 on Amazon Kindle[2] was No. 1 on Amazon's Mystery/Thriller lists, and was characterized as "a blockbuster debut" by Entertainment Weekly. His latest book, Killer in the Hills, was published by Amazon in December 2011.[1] As of December 2011[update], he was developing a one-hour mystery series for NBC.[2]
He is currently working on several Kindle Vella series, Killer be Killed and The Grimm Curse.