Anna Skowrooska is not only an author of children's books, but also a publisher--she has been co-founder of Muchomor publishing house for over 20 years. In addition to the series, which includes Air, Water, Fire, Energy, and Earth , she has also written children's books such as Alfabet niepodleglosci ("The Alphabet of Independence"), Alfabet polski ("The Polish Alphabet"), and swiety Franciszek ("Saint Francis"). She lives in Poland. Malgorzata Nowak and Agata Dudek are two graduates of Warsaw's Academy of Fine Arts who together run the Acapulco graphic studio. They specialize in illustration and book design and have worked on such titles as Anna Onichimowska's Tajemnica Malutkiej ("Little's Secret"), and MISTRZ. Spotkanie z Witoldem Lutoslawskim ("MASTER. The meeting with Witold Lutoslawski") by Anna Czerwioska-Rydel and Pawel Rydel. They live in Poland.