Zoë Tucker is passionate about picture books and spends (almost) every day in the world ofchildren's publishing. Working as an art director and designer, she has the opportunity to workwith authors, artists, and publishers from all over the world. Zoë lives and works on the south coast of England, with her husband, Adam, and her cat, Murray, and she uses a computer (almost) every day! Ada and the Number-Crunching Machine is her debut as a picture book author. Rachel Katstaller is an illustrator from tiny tropical El Salvador. After attending the Summer Residency in Illustration at the School of Visual Arts in New York City in 2014, Rachel decided to pursue her lifelong dream of becoming a children's book illustrator. Since then, Rachel has relocated to the Austrian Alps along with her cat, Hemingway.