SARAH WASSNER FLYNN is a longtime writer for National Geographic Kids. She loves writing, running, and triathlons. When she's not writing about races, she's usually training or competing in one. She also writes nonfiction books and articles for kids and teens, like National Geographic Kids National Park Guide U.S.A., This Book Stinks!, Weird But True Know-It-All Greek Mythology, and Girls' Life Guide to Being the Most Amazing You.
ALVIN HALL is an internationally recognized, award-winning financial educator, author, and television and radio host. He’s the author of the best-selling financial advice books You and Your Money, Your Money or Your Life, What Not to Spend, Getting Started in Mutual Funds, and his 2008 children’s book Show Me the Money. In 2006, he was awarded the Wincott Award for business journalism for his 2006 documentary Jay-Z: From Brooklyn to the Boardroom about the life of rapper Jay-Z. In addition, he was the longtime host of the award-winning BBC radio finance program Your Money or Your Life.