Justina Ireland is the New York Times bestselling author of Promise of Shadows, Vengeance Bound and the Devil's Pass series. An active figure in the YA community, she has an MFA in Writing for Children and Young Adults from Hamline University and started a database for sensitivity readers at Writing in the Margins.

Petur Antonsson is a freelance illustrator for publishing and animation who lives in Reykjavik, Iceland. His full name is Pétur Atli Antonsson Crivello, and he was born and raised in Iceland by his Icelandic mother and French father.

He graduated from the Academy of Art University in San Francisco in 2011 with a BFA in illustration. Petur worked in the gaming industry in San Francisco before moving back to Iceland, where he’s currently doing freelance illustration work for various clients and companies around the world. He is represented by Shannon Associates.