Buckley is the author of more than 200 nonfiction books for kids, including 14 titles in the New York Times-bestselling Who Was...? biography series. He has written for Scholastic, DK Publishing, National Geographic Kids, Discovery Books, and many others. He is also the author of nine books in the Show Me History! graphic nonfiction series. He lives in Santa Barbara, California, and is a frequent visitor to Seattle and San Francisco.