Doreen Cronin is the author of many New York Times bestselling books, including Caldecott Honor Book Click, Clack, Moo and its sequels (with 8.5 million copies sold and over 20 years in print); and Diary of a Worm and its sequels (7 million copies sold worldwide); as well as a host of other beloved picture books. She and Brian are also the creators of Mama In the Moon.

Brian Cronin is an internationally known illustrator whose work has appeared in the New York Times, GQ, Entertainment Weekly, and many other publications throughout the world. He won the Society of Illustrators' Founders Award for his first book, The Lost House, and a New York Times Best Illustrated Award for The Lost Picnic.