Kwame Mbalia is the New York Times best-selling author of Tristan Strong Punches a Hole in the Sky, for which he received a Coretta Scott King Author Honor award. The book was also named to best-of-the-year lists compiled by Publishers Weekly, the Chicago Public Library, and the New York Times. The second book in the trilogy is Tristan Strong Destroys the World. Kwame lives with his wife and children in Raleigh, North Carolina, where he is currently working on the third book about Tristan. Follow him on Twitter @KSekouM.
Rick Riordan (www.rickriordan.com) is the author of the # 1 New York Times best-selling The Heroes of Olympus, Book One: The Lost Hero; The Heroes of Olympus, Book Two: The Son of Neptune; The Heroes of Olympus, Book Three: The Mark of Athena; the #1 New York Times best-selling Kane Chronicles; and the five books in the #1 New York Times best-selling Percy Jackson and the Olympians series. His previous novels for adults include the hugely popular Tres Navarre series, winner of the top three awards in the mystery genre. He lives in San Antonio, Texas, with his wife and two sons.