Judith Lewis, better known by her pen name Cassandra Clare, is an American author of young adult fiction, best known for her bestselling series The Mortal Instruments.

Holly Black is an American writer and editor best known for her children's and young adult fiction. Her most recent work is the New York Times bestselling young adult Folk of the Air series. She is also well known for The Spiderwick Chronicles, a series of children's fantasy books she created with writer and illustrator Tony DiTerlizzi, and her debut trilogy of young adult novels officially called the Modern Faerie Tales. Black has won an Eisner Award, a Lodestar Award, a Nebula Award, and a Newbery Honor.