Mariam Gates Mariam Gates holds a master's in education from Harvard University and is the creator of the renowned Kid Power Yoga. She is the author of the bestselling Good Night Yoga and many other yoga-related books for children. She lives in Northern California. For more, see mariamgates.com. Sarah Jane Hinder Sarah Jane Hinder, illustrator, creates acrylic artwork for a variety of children's books, including Good Morning Yoga, The Three Little Pigs, and The Elves and the Shoemaker. She lives in Manchester, England, with her husband and two chihuahuas. See sarahjanehinder.com.