Ross Montgomery started writing stories as a teenager, when he should have been doing homework. After graduating, he decided to channel these skills into teaching at a primary school.

Author of Alex, the Dog and the Unopenable Door and The Tornado Chasers, Ross has been shortlisted for the Costa Book Award and nominated for the Branford Boase Award. He lives in Brixton, London. Space Tortoise is his second picture book, following The Building Boy.

Sarah Warburton is the oldest of four sisters, raised in Virginia, and an avid reader and knitter. She has a B.A. in Latin from the College of William and Mary, an M.A. in classics from the University of Georgia and another from Brown. Sarah has worked at independent bookstores-Page One Books in Albuquerque and Books on the Square in Providence-and spent ten years as a writer, which led her to become lead editor for UpClose Magazine. Her short story "Margaret's Magnolia" appeared in Southern Arts Journal, and her Pushcart prize nominated story "Survival English" appeared in Oyster River Page. Now she lives with her family-husband, son, daughter, and hound dog-in the mountains of Southwestern Virginia.