Nancy E. Krulik (born in Brooklyn, New York) is the author of more than 200 books for children and young adults, including three New York Times bestsellers. Krulik is the author and creator of several book series, beginning with Katie Kazoo, Switcheroo in 2002. The How I Survived Middle School series launched in June 2007. In July 2008, Grosset and Dunlap (a division of Penguin Young Readers) launched the George Brown, Class Clown series, a spin-off of Katie Kazoo, with the book Super Burp. Her mystery series for kids, Jack Gets a Clue launched in 2011. In 2013, she published the Magic Bone series, which follows the adventures of Sparky, a sheepdog puppy, who travels the world thanks to the magic he finds in a very special chew toy. She has also written a number of celebrity biographies for young readers, including a biography of Leonardo DiCaprio that made the New York Times bestseller list.