Kersten Hamilton is the author of numerous books for children, including the picture books First Friend , Red Truck , Yellow Copter , and Blue Boat . She lives in New Mexico. Visit her website to learn more. Lili Chin is an illustrator best known for her pet-centric art and gift products as well as her dog body language infographics, which are popular with dog owners and relied on by renowned animal behavior experts and advocacy organizations around the world. She also authored and illustrated Doggie Language : A Dog Lover's Guide to Understanding Your Best Friend , which is being translated into multiple languages. She lives in Los Angeles and is the parent of Boogie the Boston Terrier and two rescue cats, Mambo and Shimmy. Visit her website and follow her on Instagram and Twitter.