Donna Jo Napoli is the author of many distinguished books for young readers, among them Daughter of Venice, Crazy Jack, The Magic Circle, Zel, Sirena, and Stones in Water. She has a B.A. in mathematics and a Ph.D. in Romance linguistics from Harvard University and has taught widely at major universities in America and abroad. She lives with her family in Swarthmore, Pennsylvania, where she is a professor of linguistics at Swarthmore College.