Sally M. Walker is the award-winning author of more than sixty books for children, including the companion books Earth Verse: Haiku from the Ground Up, illustrated by William Grill, and Out of This World: Star-Studded Haiku, illustrated by Matthew Trueman. She is also the author of Underground Fire: Hope, Sacrifice, and Courage in the Cherry Mine Disaster; Sinking the Sultana: A Civil War Story of Imprisonment, Greed, and a Doomed Journey Home; Boundaries: How the Mason-Dixon Line Settled a Family Feud and Divided a Nation; and Champion: The Comeback Tale of the American Chestnut Tree, an Orbis Pictus Honor Book. Sally M. Walker lives in Illinois. Angela Mckay is an illustrator and textile designer. She draws her inspiration from many places, including the natural world, overseas travel adventures, museums, vintage books, and films. She works primarily in gouache and watercolor. Trees: Haiku from Roots to Leaves is her picture book debut. Angela Mckay lives in Perth, Australia.