Marta Zafrilla, born in Murcia (Spain) in April 1982, is a teacher and an award-winning author and poet. She has published several collections of poetry in Spain and been included in multiple anthologies. Her poems and book reviews have appeared in cultural publications and she has held various jobs with advertising agencies and publishers. She also writes children¿s literature, being Chirpy Charlie¿s Teeth one of her most famous books.

Sonja Wimmer loves painting pictures and telling stories. After studying and working for some years as a graphic designer in her hometown of Munich and Brussels, she decided to pack her suitcase and move to Barcelona to study Illustration at the Llotja Arts and Crafts School. Since then, she lives between brushes and stories, working as an illustrator and freelance for publishers and other customers worldwide. She has received many awards for her work in the United states, most notably Gold Medal for Best Illustrator for The Word Collector.