Susanna Isern is a writer, psychologist and mother of three. She has published more than thirty children's books. Most of her books have been sold around the world and can be found in fifteen different languages. Two of her books have received silver medals in the Moonbeam Children's Book Awards (US). Isern manages the medical team at Aula Dédalo de Santander and is a professor at the Universidad Europea del Atlántico. Rocio Bonilla has a degree in Fine Arts from the University of Barcelona and also holds a CAP (PGCE). She studied Illustration with Ignasi Blanch and Roger Olmos. In addition to illustrating around thirty books, she has also provided illustrations for magazines, painted murals and designed signs. She won the 2015 Spanish Ministry for Culture and Education's prize for best book and the 2017 Premio Crítica Serra d’Or. Her books have been translated and published in more than ten countries.