Johanna Spyri was a Swiss author who was born in 1827. She wrote over 50 books, of which Heidi was her most famous.
Lisa Regan is the author of more than 200 published titles, including puzzle books, children's reference books and licensed-character books.
Joëlle Dreidemy was born in Saint-Avold in France. She now lives and works in Paris, France, producing illustrations for magazines and children's books.