MAUREEN FERGUS is an award-winning author of books for kids of all ages. Her books have been translated into a dozen languages, optioned for film and adapted for stage. Her picture books include InvisiBill, The Day Santa Stopped Believing in Harold, and You're In Good Paws; and she's also the author of the upcoming Weenie early graphic novel series. When not writing, Maureen runs, reads, bikes, bakes, works and hangs out with her husband, three kids and Buddy the Wonder Dog, who rarely has tantrums.

OLGA DEMIDOVA was born and raised in Russia, where she studied at the Moscow Art Institute of Applied Arts. Olga started work as an animator, but her tremendous passion for illustration sent her in a different direction. Now she publishes books and apps for children all over the world. Olga lives in Moscow, and she does not know an angry cow personally.