Co-author Bjørn Sortland is an accomplished Norwegian fiction writer and Professor of Creative Writing. Sortland’s books have been published in 28 countries. He has written 68 books to date and his body of work includes children's and young adult books, novels, picture books, and suspense novels, and he has received numerous Norwegian and international literary awards. His writing often deals with the strange and complex aspects of the children's universe, infused with warmth, humour, and a sensitivity to the difficulties of growing up, including issues of love, identity, and pain.

Co-author Timo Parvela is a highly regarded Finnish writer known for his ability to capture the minds and imaginations of young readers through humour and a touch of magic. His books have been widely recognized and have been translated into more than 30 languages, with worldwide sales of over 6 million copies. In addition to several adaptations for theatre and film, Parvela's work is often used in the Finnish school curriculum. He holds a bachelor's degree in Pedagogy/Education from Jyväskylä University and worked as a primary school teacher for almost a decade before becoming a full-time writer in 1996. His first published work was the young adult novel "About a Boy" (Poika) in 1989, and he has written over 100 books in his career thus far. His most popular and enduring series, "Ella and Friends," has followed the adventures of a primary school class and their teacher in over 30 books (and counting), which have been translated into over 25 languages. Parvela has written over 100 books and his other successful series include the Finlandia Prize-winning "Seesaw Trilogy”, "Purdy & Barker" series, and "Pete" books, as well as the 13-part "Kepler62" series and his newest "Mission Nearly Impossible" series and "Shadows" trilogy. He is married and has two grown children, and lives in Kirkkonummi, in southern Finland.

Pasi Pitkänen is a renowned Finnish illustrator, graphic designer, and published picture book author with a degree in Graphic Design. He has also studied animation, cinema, and astrology, and has previously worked at Rovio Entertainment as an illustrator, character designer, and graphic artist. Pitkänen’s illustrations for Rovio’s Angry Birds books have been published worldwide.