Jujja Wieslander is a Swedish author and illustrator known for her children's books. She has collaborated with her husband, Tomas Wieslander, to create engaging stories that often feature whimsical characters and imaginative plots. Her most famous work is the Mamma Moo series, which follows the adventures of a curious cow and her friend, Crow. Wieslander's books are celebrated for their charming illustrations and relatable themes, making them popular among young readers and parents alike.