Author and photographer of nature book for children; recipient of 2011 ALA Sibert Medal for Nonfiction for Kakapo Rescue: Saving the World’s Largest Parrot, 2008 Sibert Honor and Orbis Pictus Honor for Nonfiction for Spiders, 2007 Sibert Honor and Orbis Pictus Honor for Nonfiction for Quest for the Tree Kangaroo.
Author of Babymouse series of graphic-novel series, recipient of 2011 Newbery Honor for Turtle in Paradise, 2007 Newbery Honor for Penny from Heaven, 2000 Newbery Honor for Our Only May Amelia.
Former textbook writer, current nonfiction author and recipient of the 2013 Sibert Award for Nonfiction, the 2013 Newbery Honor, 2013 YALSA Award for Excellence in Nonfiction and 2013 National Book Award finalist for Bomb: The Race to Build—and Steal—the World’s Most Dangerous Weapon.