The award-winning author Virginia Kroll was born in Buffalo, New York. She has written dozens of picture books for young readers as well as hundreds of magazine pieces, has established herself as a versatile and prolific writer since beginning her career in 1992. So plentiful is Kroll's imagination and output that she writes under two pseudonyms as a way of diffusing concern over her immense productivity. Her subject matter ranges from domestic tales of sisters, to multiracial and multicultural topics, to the environment and religion.

Of Polish origin, award-winning illustrator Zuzanna Celej has a BA Honours in Fine Arts from the University of Barcelona and majored in Illustration at the Llotja Art School in Barcelona. He has specialized in illustration, fine art photography, and printmaking. She is currently mainly dedicated to the publishing world with more than 50 titles inside and outside the country. Her work has been exhibited in Spain, France, England, Italy, Poland, and the United States. She has been recognized with national and international awards, including the New York City Big Book Award for Best Illustrated Album, The Map of Good Memories (Cuento de luz, 2016). She combines illustration projects with teaching Plastic Arts in several cultural venues and in his own studio, as well as running workshops in Art Schools Masters.