Stephanie Calmenson is the author of more than one hundred books for children, including The Principal's New Clothes; Jazzmatazz!; Late for School!; Oopsy Teacher!; and Ollie's School Day: A Yes-and-No Book. She is also known for her highly acclaimed books about dogs, including Rosie, A Visiting Dog's Story, which Smithsonian Magazine called "one of the outstanding nonfiction titles of the year.” Stephanie lives in New York City and vacations in Maine.