Josephine Nobisso is the author of several books, including The Numbers Dance, Show; Dont Tell!, and The Weight of a Mass. She is the recipient of numerous awards, including Bank Street Colleges Best Book of the Year and a Catholic Press Association Award. She lives in Westhampton Beach, New York. Katalin Szegedi is the illustrator of The Weight of a Mass and was named Illustrator of the Year by Hungarys International Board on Books for Young People.