Dr Amanda Gummer is a research psychologist specializing in child development, with over twenty years experience working with children and families. She has set up three organizations – Fundamentally Children, FUNdamentals and the Good Toy Guide Ltd – all of which promote the value of play and positive parenting in child development. Amanda is frequently in the media and on expert panels for child-related issues, as well as being the British Toy and Hobby Association's spokesperson for their Make Time to Play Campaign.

Marie Kyprianou studied Plastic Arts and Modern Literature at the University of Avignon (south of France) before becoming an illustrator. When she is not drawing, Marie has all kinds of passions, including textile creation, decorating, design, good wine and funny people. Her additions to Campbell's bestselling Big Steps series, Let's Wash Our Hands and No More Dummies, are her first books for Campbell Books.