Theanne Griffith can't get you into the Maker Maze (only Dr. Crisp can do that), but she can tell you a lot of cool science facts. She is a brain scientist by day (no, she's not a zombie) and a storyteller by night.

She loves tinkering in the lab as much as she loves writing children's books. She lives in New Jersey with her family and three cats.

David Roberts has earned great acclaim for his distinctive illustrations. David's work includes collaborations with his sister Lynn on retellings of several classic fairy stories - their book Little Red was shortlisted for the 2005 CILIP Kate Greenaway Medal.

David's first collaboration with Julia Donaldson - Tyrannosaurus Drip - was published in 2007 by Macmillan, and since then they have worked together on several other picture books.

David is also the illustrator of the New York Times bestselling Rosie Revere, Engineer and Ada Twist, Scientist written by Andrea Beaty. David Roberts has been fascinated by the suffragists since his school days, and his illustrated history of the fight for women's suffrage is a real passion project.