Luis Amavisca   is a well-known visual artist and children´s writer  in Spain. He has worked and written about equality, solidarity, environment and non-violence. His  Bang Bang I Hurt the Moon , was  runner-up for the Most Inspirational Children’s Picture Book in the International Latino Book Awards.  He is the author, along with Alicia Acosta, of two highly successful co-education books: I Love My Colorful Nails! and Benji’s Doll. The Ugliest Monster in the World is one of his recently published books. 
 Betania Zacarias is an argentinian illustrator and graphic designer. Her work has been published in Mexico, Spain, England, United Arab Emirates, and Turkey. Her illustrations have been selected for the Bologna International Book Fair Fair (Italy), CJ Picture Books Awards (Korea), and the IV Illustration Ibero-American Catalog (Mexico). She works as an illustrator and a teacher.