Gianumberto Accinelli is an entomologist and writer who shares his passion for nature through eco-narration projects. He currently teaches eco-narration at the Free University of Anghiari and Natural Sciences at the Manzoni Scientific High School. He has published several books, including The Wonderful Life of Butterflies and The Wonderful Life of Bees, The Invisible Threads of Nature, A Brief History of a Sunbeam, and Other Invisible Threads of Nature. Gianumberto is also the author of Up in the Blue Sky, the companion to Down in the Blue Ocean. In 2018, he won the prestigious German Youth Literature Award and the Bologna Children's Book Fair Award. Gianumberto lives in Bologna, Italy. Giulia Zaffaroni is a high school support teacher. She has worked on projects as a freelance illustrator for publishing houses and other associations.

She explores creative paths in art and drawing for children, and also offers projects on visual education and reading illustrated books. Giulia lives in Milan.