Louise Bates Ames is a lecturer at the Yale Child Study Center and assistant professor emeritus at Yale University. She is co-founder of the Gesell Institute of Child Development and collaborator or co-author of three dozen or so books, including The First Five Years of Life, Infant and Child in the Culture of Today, Child Rorschach Responses, and the series Your One-Year-Old through Your Ten- to Fourteen-Year-Old. She has one child, three grandchildren, and four great-grandchildren.

Carol Chase Haber is a school psychologist in the Hamilton County, Ohio, school system and is a trained and qualified Gesell Examiner. She is the co-author of several books, including He Hit Me First, Your Seven-Year-Old, Your Eight-Year-Old, and Your Nine-Year-Old.