Daniel Kirk has written and illustrated numerous books, including Hush, Little Alien; Bigger; Humpty Dumpty; Jack and Jill; Moondogs; and Snow Family. In addition he has illustrated two poetry collections; Go! and Dogs Rule!; and several titles by other authors, namely Chugga Chugga Choo Choo and My Truck Is Stuck by Kevin Lewis, and Hello, Hello! by Miriam Schlein. Kirk lives in New Jersey with his wife, author-illustrator Julia Gordon, and three teenage children.