Scott Westerfeld is the No. 1 New York Times best-selling author of the “Uglies” series, which has been translated into 35 languages; the “Leviathan” series; “Afterworlds”; “Horizon”; and many other books for young readers. He has held jobs as a factory worker making lead soldiers, substitute teacher, textbook editor, software designer and ghost writer. His new book is “Impostors” (Scholastic). Westerfeld says he “never” wears jeans. “Never!”