Rachel Vail is the author of children's books including Sometimes I'm Bombaloo and Righty and Lefty, in which she also collaborated with artist Matthew Cordell. She is also the author of several books for teens and middle grade readers, including If We Kiss, You Maybe, Gorgeous, Wonder, and Never Mind, which she wrote with Avi. Vail attended Georgetown University, where she earned her B.A. in English and Theater. She lives in New York City with her husband and two sons.
Matthew Cordell is author and illustrator of Trouble Gum. He has also illustrated books including Mighty Casey by James Preller and Toby and the Snowflakes, written by his wife, Julie Halpern. He lives outside of Chicago.