Leo Dillon, award-winning illustrator, has passed away at the age of 79. Working in collaboration with his wife Diane, Dillon illustrated numerous picture books for children, including the Caldecott Medal winners Why Mosquitoes Buzz In People's Ears and Ashanti To Zulu: African Traditions. The Dillons also created illustrations for the Madeleine L'Engle novels A Wrinkle In Time and A Swiftly Tilting Planet.

Leo and Diane Dillon were also famous for their cover artwork for adult science fiction novels, winning the Hugo Award in 1971 for Best Professional Artist.