Wendy Meddour was a lecturer at Oxford University before becoming a full-time writer. She is the author of numerous picture books, but Grandpa's Top Threes is her Candlewick Press debut. She lives in the U.K.

Daniel Egnéus is an award-winning illustrator whose work has been published around the world, including special illustrated editions of Neil Gaiman's Anansi Boys, Black Dog, The Monarch of the Glen, and American Gods. This is Daniel Egnéus's Candlewick Press debut. He lives in Athens, Greece.