Jory John is a #1 New York Times–bestselling author of books for both children and adults. His work includes the New York Times–bestselling picture books The Good Egg and The Bad Seed; the award-winning Goodnight Already! series; the popular picture books Probably a Unicorn, Penguin Problems and Giraffe Problems; and the New York Times–bestselling The Terrible Two series. He lives in Portland, Oregon.

Erin Kraan is a children’s book illustrator, woodcutter, and printmaker. She loves the process of carving her characters into wood and seeing how their quirky and whimsical identities come to life through the ink in the prints. You can often find her doodling while drinking coffee and wearing cozy socks that are usually inside out or backwards. Something's Wrong! is her debut picture book. She lives in Vancouver, British Columbia.