Rachel Vail is the author of many beloved picture books and novels, including Righty and Lefty, Jibberwillies at Night, Sometimes I'm Bombaloo, the Mama Rex & T series, Lucky, and You, Maybe. Rachel loves talking with kids -- hearing their stories and reactions, discussing their hopes and their worries. She get many of her ideas from the letters she receives. Rachel lives in New York City with her husband and her two sons. Visit rachelvail.com.

Hyewon Yum is the author and illustrator of many acclaimed picture books, including Mom, It's My First Day of Kindergarten!, which received the Ezra Jack Keats New Illustrator award and was selected as a Kirkus Reviews Best Book of the Year. She lives in Brooklyn, New York. Visit Hyewon online at hyewonyum.com.