Vivian French is a highly acclaimed children's author who has written more than 250 books during the course of her career, including Caterpillar, Butterfly, The Tales from the Five Kingdoms series and Yucky Worms.

Her recent work includes the critically acclaimed picture book The Most Wonderful Thing in the World and junior fiction The Adventures of Alfie Onion, The Cherry Pie Princess and The Witches' Midnight Feast.

Vivian teaches on the illustration course at Edinburgh School of Art, and helped to found the mentoring scheme Picture Hooks for aspiring young illustrators. She lives in Edinburgh

Charlotte Voake is the author-illustrator of Ginger, shortlisted for the Kate Greenaway Medal and winner of the Nestlé Smarties Gold Award, Ginger Finds a Home and Hello Twins, one of the 2006 New York Times Ten Best Illustrated Books. She is also the illustrator of Steve Voake’s Insect Detectives and Vivian French’s Caterpillar Butterfly. She lives in Surrey.