Jenna Lettice is a Brooklyn-based children's book editor. She was inspired to write the 12 Days series by memories of her mother's preparation for Valentine's Day, when she would put a small gift for Jenna in a Valentine's mailbox on each of the days leading up to the holiday.

Colleen Madden is the illustrator of several children's books, including Mariah Carey's picture-book version of "All I Want for Christmas Is You." She lives in the Philadelphia area with her husband and two sons.