Mary Auld is an award-winning writer of children's information books, most notably How to Build an Orchestra with the London Symphony Orchestra. She conceived and wrote all six titles in the Start Small, Think Big series. She has a passion for nonfiction and divides her time between London and Paris. Hannah Bailey is an illustrator who is inspired by the natural world, growing things, and history. She specializes in nonfiction picture books for children as well as editorial and food illustration. She has illustrated a number of picture books, including the award-winning When the Whales Walked by Dougal Dixon and Explore! America's National Parks. Bailey lives and works in Somerset, England.