What twelve book children series was started during the summer of 2007 and the first book was publisehed in 2003?
Louie del Carmen:  During the summer of 2007 he began working as a story artist at Dreamworks Animation on some of their notable and successful projects like "Kung Fu Panda", "How to Train Your Dragon" and "The Croods". How to Train Your Dragon:  The first book was published in 2003 and the last one in 2015.
How to Train Your Dragon