Paul B. Janeczko (1945-2019) was a poet and teacher who edited numerous award-winning poetry anthologies for young people, including A Poke in the I, A Kick in the Head, A Foot in the Mouth, and The Death of the Hat, all of which were illustrated by Chris Raschka; Firefly July, illustrated by Melissa Sweet; and The Proper Way to Meet a Hedgehog and Other How-To Poems, illustrated by Richard Jones. He also wrote Worlds Afire; Requiem: Poems of the Terezín Ghetto; Top Secret: A Handbook of Codes, Ciphers, and Secret Writing; Double Cross: Deception Techniques in War; The Dark Game: True Spy Stories from Invisible Ink to CIA Moles, a finalist for the YALSA Award for Excellence in Nonfiction for Young Adults; and Secret Soldiers: How the U.S. Twenty-Third Special Troops Fooled the Nazis.

Jenna LaReau is a graduate of the Parsons School of Design in New York. Top Secret is her first book with Candlewick Press. She lives in Massachusetts, where she works as an illustrator and designer.