Licenciada en psicología y especialista en juegos de ingenio y entretenimiento mental. Ha publicado más de 200 libros, algunos de los cuales se han traducido a 22 lenguas.

Susie Hammer is an independent illustrator and author of children's books from Polonia. She has lived and worked in Madrid for 10 years, where she studied illustration and graphic design. Now, she lives in Barcelona.

Àngels Navarro is a Catalan play therapist and psychomotor education specialist. She has written more than 200 books and produced television programs and online games. Some of her books have been translated into 22 languages.