John Grogan is the author of the #1 international bestseller Marley & Me: Life and Love with the World's Worst Dog, the bestselling middle-grade memoir Marley: A Dog Like No Other, and three #1 best-selling picture books: Bad Dog, Marley!, A Very Marley Christmas, and Marley Goes to School. John lives with his wife and their three children in the Pennsylvania countryside.

John Grogan ha sido un premiado reportero gráfico y columnista por más de veinticinco años. Vive en Pensilvania con su esposa Jenny y sus tres hijos.

Richard Cowdrey has illustrated numerous books for children, including Bad Dog, Marley! by John Grogan, Animal Lullabies by Pam Conrad, and Frosty the Snowman by Steve Nelson and Jack Rollins. He is the owner of a yellow Labrador, Murray, whose behavior is remarkably similar to Marley's. He lives in Ohio with his wife and children.