Deborah Hopkinson is the author of many highly acclaimed picture books, including A Letter to My Teacher, which received two starred reviews, and the modern classic Sweet Clara and the Freedom Quilt, which the New York Times called "inspiring." Her other books include Sky Boys: How They Built the Empire State Building, a Boston Globe-Horn Book Honor Book; and Abe Lincoln Crosses a Creek: A Tall, Thin Tale, an ALA-ALSC Notable Children's Book. She lives in Oregon with her family.

Nik Henderson was raised in Strafford, Missouri, where he still lives, and studied illustration at the Savannah College of Art and Design in Savannah, Georgia. He is the illustrator of Trucks on Trucks by Sorche Fairbanks, which Booklist praised for its "eye-catching" art. Evidence! is his second picture book.