Joanna Schaffhausen wields a mean scalpel, skills developed in her years studying neuroscience. She has a doctorate in psychology, which reflects her long-standing interest in the brain—how it develops and the many ways it can go wrong. Previously, she worked for ABC News, writing for programs such as World News Tonight, Good Morning America, and 20/20. She lives in the Boston area with her husband and daughter. Her latest book, No Mercy, is now available from Minotaur Books.