Kat Zhang (born 1 April 1991) is an American award-winning author of young adult and middle grade literature. She has also written two picture books, Amy Wu and the Perfect Bao and Amy Wu and the Patchwork Dragon. Her first trilogy, The Hybrid Chronicles, was published by HarperCollins in the United States. According to WorldCat, the series is held in 2,545 libraries, and has been translated into Chinese, German, Spanish, French, Portuguese, Polish and Italian. The first volume, What's Left of Me, was published in 2012; the second volume, Once We Were, was published in 2013; and the third and final volume, Echoes of Us, was published in 2014. Source: Wikipedia (en)