Kathleen Krull is well known for her innovative, award-winning nonfiction for young people, including Lives of the Explorers, Lives of the Musicians, and all other books in this popular series illustrated by Kathryn Hewitt. She is also the author of Harvesting Hope: The Story of Cesar Chavez, illustrated by Yuyi Morales, as well as The Beatles Were Fab (and They Were Funny) and Lincoln Tells a Joke: How Laughter Saved the President (and the Country), both co-written with Paul Brewer and illustrated by Stacy Innerst. She lives in San Diego, California. Visit her online at kathleenkrull.com. Julia Sarda has illustrated everything from classic children's books to concept art for merchandise and video games. She lives in Barcelona. Visit her online at juliasarda.

com and on Instagram @juliasardaportabella.