Kat Zhang (born 1 April 1991)[1][2] is an American award-winning[3][4] author of young adult and middle grade literature.

According to WorldCat, the series is held in 2,545 libraries,[6] and has been translated into Chinese, German, Spanish, French, Portuguese, Polish and Italian.

[8] Hybrid Chronicles series is set in an alternate universe society in which every body possesses two 'souls' or human identities at birth.

The girls hide the presence of Eva, who has lost control of their shared body but never completely faded, for fear of what might happen if they were ever discovered.

[13][14] Zhang's second middle grade novel, The Memory of Forgotten Things, is a return to science fiction.

[15][16] The first in the trilogy, What's Left of Me, was chosen as a 2012 BEA Buzz book[17] and given a starred review on Publishers Weekly.