Michael Dahl is the prolific author of the bestselling Goodnight Baseball picture book and more than 200 other books for children and young adults. He has won the AEP Distinguished Achievement Award three times for his nonfiction, a Teacher's Choice award from Learning magazine, and a Seal of Excellence from the Creative Child Awards. And he has won awards for his board books for the earliest learners, Duck Goes Potty and Bear Says "Thank You!" Dahl has written and edited numerous graphic novels for younger readers, authored the Library of Doom adventure series, the Dragonblood books, Trollhunters, and the Hocus Pocus Hotel mystery/comedy series. Dahl has spoken at schools, libraries, and conferences across the US and the UK, including ALA, AASL, IRA, and Renaissance Learning. He currently lives in Minneapolis, Minnesota in a haunted house.
Jeff Yesh is a freelance illustrator and graphic designer whose award-winning work has been featured in multiple children's books. As a freelance artist, he splits his time illustrating both fiction and non-fiction works enjoyed by all ages, in addition to designing material for a wide variety of clients in the advertising and sports industries. Born and raised in Indiana, Jeff graduated from Indiana State University with a Bachelor of Fine Arts in Graphic Design. Based in Carmel, Indiana, Jeff enjoys being active outdoors and spending time with his wife and two daughters.