Holly Black was born in New Jersey in 1971. She graduated with a B.A. in English from The College of New Jersey in 1994. Holly's first book, Tithe: A Modern Faerie Tale (Simon & Schuster) was published in 2002 and was included in the American Library Association's Best Books for Young Adults. She has since written two other books in the same universe, Valiant (2005), and the sequel to Tithe, Ironside (2007). Valiant was a finalist for the Mythopoeic Award for Young Readers and the recipient of the Andre Norton Award for Excellence in Young Adult Literature. Holly collaborated with Caldecott award winning artist, Tony DiTerlizzi, to create the bestselling Spiderwick Chronicles. The books have been translated into over 30 languages and adapted into a film by Paramount Pictures in conjunction with Nickelodeon Films. Holly's first collection of short fiction, Poison Eaters and Other Stories, came out in 2010 from Small Beer Press. Holly lives in Massachusetts with her husband Theo.
Justine Larbalestier was born and raised in Sydney, Australia. She is a young-adult fiction author and is best known for the Magic or Madness trilogy: Magic or Madness, Magic Lessons and Magic's Child. Her other works include Liar, How to Ditch Your Fairy, and The Battle of the Sexes in Science Fiction.