Katherine Irwin Katherine (Katy) Irwin, Ph.D., is a professor of sociology at the University of Hawai'i. Her research areas include youth culture, women and drug use, youth violence, girls in the juvenile justice system, and delinquency prevention programming. She is the co-author, with Meda Chesney-Lind, of Beyond Bad Girls: Gender, Violence, and Hype (Routledge, 2008). Her most recent book with Karen Umemoto is titled Jacked Up and Unjust: Pacific Islander Teens Confront Violent Legacies.